In July 2025, Substack closed a $100 million Series C round, bringing its valuation to $1.1 billion. Unicorn status. The round was led by BOND and The Chernin Group, with participation from Andreessen Horowitz, Klutch Sports Group founder Rich Paul, and Skims co-founder Jens Grede.
The press coverage was largely celebratory. A win for creators. A validation of the independent media model. Proof that the newsletter era is real and bankable.
I want to push back on that narrative — not because Substack isn’t a significant platform, but because what this valuation actually reveals is less flattering than the headlines suggest. It tells us more about how desperate the media industry has become for a coherent business model than it does about Substack’s ability to sustain one.
The numbers behind the number
Let’s start with what’s publicly known. Sacra estimates Substack hit roughly $45 million in annualized revenue by mid-2025. That’s up from approximately $37 million in 2024 and $30 million in 2023 — growth that’s real, but not explosive. The company reportedly reached positive cash flow only in Q1 2025, eight years after launch.
At $45 million in revenue, the $1.1 billion valuation implies a roughly 24x revenue multiple. For context, as John Gruber noted on Daring Fireball, the New York Times Company — with its massive newsroom, investigative apparatus, Games division, Wirecutter, The Athletic, and 10+ million subscribers — has a market cap of around $8.5 billion. Substack’s investors are essentially saying the platform is worth about one-eighth of the Times. On roughly one-two-hundredth of the revenue.
That’s not a valuation grounded in Substack’s current performance. It’s a bet on a story. And the story being told is that traditional media is collapsing so fast that the platform catching the refugees will eventually own the market.
The refugee theory of value
Substack’s recent momentum is undeniable. The platform now boasts more than 5 million paid subscriptions, up from 2 million in 2023. More than 50 creators earn over $1 million annually. The top 10 alone collectively generate around $40 million per year. High-profile journalists who left or lost positions at CNN, MSNBC, and ABC — names like Jim Acosta, Joy-Ann Reid, and Mehdi Hasan — have quickly built substantial audiences on the platform.
This is the engine that investors are backing. As traditional media sheds staff, Substack absorbs the talent. Each departing anchor becomes a case study. Each layoff at a legacy outlet is, effectively, a customer acquisition event for Substack.
It’s a compelling growth narrative. It’s also a deeply fragile one. A business model that depends on the ongoing collapse of another industry is not the same as a business model that stands on its own. If legacy media stabilizes — or if creators find better alternatives — Substack’s funnel narrows considerably.
What the valuation obscures
There are structural realities beneath the headline numbers that warrant more scrutiny from anyone building a content business.
The income distribution on Substack mirrors the broader creator economy almost exactly. The top 10 authors account for $40 million in annual revenue — a staggering concentration considering the platform hosts more than 17,000 paid writers. A detailed analysis from mid-2025 found that only about 45 publications earn an estimated $1 million or more per year, and 44 of those 45 fall within just six categories — dominated by U.S. politics, finance, and tech.
For everyone outside that narrow band, the economics are significantly less glamorous. Only about 5% of Substack’s total subscriptions are paid. The conversion rate for the average publication hovers around 3%. Most writers on the platform are, by any reasonable measure, giving away their work for free to an audience that hasn’t been persuaded to pay.
This isn’t a criticism of individual writers. It’s a structural observation about a platform that gets valued at $1.1 billion while the vast majority of the people producing its content earn little to nothing from the arrangement. Substack takes 10% of all subscription revenue. On top of that, Stripe takes roughly 3%. The platform captures its cut whether you’re earning $5 million a year or $50. The value flows upward.
The platform risk nobody wants to discuss
Substack’s cofounders framed the fundraise in idealistic terms. “Technology should serve [creators], not the other way around,” they wrote in the announcement. “We’re building tools and a network to protect their independence.”
But the trajectory suggests something different. Substack is actively evolving from a newsletter tool into a content network — with its Notes feed, recommendation engine, mobile app, video features, livestreaming, Apple TV and Google TV apps, and pilot sponsorship programs. As Casey Newton observed on Platformer, Substack’s cofounders told the New York Times the company is “more interested in taking on YouTube than MailChimp.”
That should give every independent publisher pause. The pivot from tool to platform to network is well-documented in tech, and it rarely ends well for the creators who built the network’s early value. The incentives shift. What begins as “we succeed when creators succeed” gradually becomes “we need to monetize the attention that passes through our system” — because that’s what a $1.1 billion valuation demands.
Substack currently generates millions of pageviews it doesn’t monetize at all. It absorbs the cost of sending emails for free-tier writers. A growing number of high-revenue creators have already begun migrating to competitors like Ghost and Beehiiv to avoid the 10% platform fee. As those economics tighten, the pressure to extract more value from the network — through advertising, algorithmic curation, or reduced creator payouts — will intensify.
We’ve seen this pattern before. It has a name now: enshittification. And the stage is being set.
What this means for bloggers and independent publishers
None of this is to say Substack is useless. For certain writers — particularly those with existing audiences, strong personal brands, and topics that command premium subscription prices — it remains an effective distribution channel. The recommendation engine is genuinely useful for growth. The reader app creates a discovery layer that email alone can’t replicate.
But bloggers should be clear-eyed about what Substack is and what it isn’t.
It is not a path to media independence. Building on Substack means building on someone else’s platform, subject to their terms, their algorithm, their pricing, and their strategic pivots. Your subscriber list is exportable — for now. Your content lives on their servers. Your growth is partly determined by their recommendation algorithm. That’s not independence. That’s tenancy with favorable lease terms.
For bloggers who already own their infrastructure — their domain, their email list, their content archive — the case for moving to Substack should be weighed against what you’re giving up: full control, zero platform fees, and immunity from whatever strategic direction the company takes after burning through $200 million in venture capital.
The 2025 Creator Spotlight Monetization Report found that creators who own their audience — meaning they hold email addresses directly, not through a platform — are 2.7 times more likely to earn $31,000 or more than those who are fully platform-dependent. That data point alone should inform every blogger’s platform strategy.
The real question behind the valuation
Substack’s $1.1 billion valuation doesn’t prove that newsletters are the future of media. It proves that investors believe the collapse of traditional media is accelerating fast enough that whoever builds the default alternative will capture enormous value.
That may turn out to be true. But it’s a bet on destruction, not creation. And the creators who build their entire strategy around a platform making that bet may find, eventually, that the platform’s interests and their own have quietly diverged.
The writers who will be in the strongest position five years from now won’t be the ones who chose the right platform. They’ll be the ones who built something they own — an audience they can reach directly, on infrastructure they control, with a business model that doesn’t depend on anyone else’s valuation story working out.
That’s not the exciting narrative. It never is. But it’s the one that actually holds up.
