I think the closest thing on the Fedi to what you’re looking for is #Mitra , it’s Fedi software supporting payments and subscriptions, you can check it out. There’s a list of instances on FediDB.

Content subscription service. Subscriptions provide a way to receive monthly payments from subscribers and to publish private content made exclusively for them.

Supported payment methods: Monero, a peer to peer digital cash system where transactions are private by default.

https://codeberg.org/silverpill/mitra

I’m not sure if the 13k number is accurate, because if you’ll look at the list a lot of Misskey instances don’t report their MAU for some reason

You can always choose an instance that defederates Threads, that the beauty of the open web