The overall idea behind sub.club is simple: people can pay a set amount of recurring donations, and gain access to posts from a private ActivityPub account for exclusive content. Creators using sub.club post private DM’s to their sub.club actor, and these messages get relayed into the private feed. Creators display their sub.club account handles in their profile fields, and apps such as Mammoth and Ice Cubes can read that value, and display a special subscription button.

Okay so it's Patreon for microblogging. Why not, if there is an audience.

Thinking about it, a federated OnlyFans could be an interesting concept.

At first I thought it was paid instances of established platforms, a la https://communick.com/services/lemmy/