Self-hosted platforms without federation usually get rekt by network effects and a big use-case for Discord is effortlessly joining large communities without having to constantly create accounts. I see that the README mentions guest accounts; do those work like they do on IRC servers? Joining an IRC server with a guest account back in the day wasn't a particularly bad experience.

Seems too good to be true by the feature list.

Well, it's vibecoded, so it's going to be a maintenance nightmare if it tries to be more than a proof-of-concept.