The claims in this post are from a blog post written by one of the devs of Fermi, a client for Stoat competitor Spacebar. I haven't fact-checked this yet, so take with a grain of salt;
https://blog.fermi.chat/discordAlts/revolt/
Although it's technically possible to self-host Stoat, the client apps are hardcoded to point to stoat.chat, not your instance. Also a bunch of the code it depends on is under proprietary (Source Available?) licenses, and can be hard to find, as it's not all in one repo.
(2/?)