He is a developer (github) and in fact had a pull request merged in August. I suppose it’s possible it was a “legal agreement”. It seems implied that it wasn’t, and that was what I remembered when replying

Discord mod/developer message. Posted to Ryujinx’s twitter (xcancel)

literally what happened

Could have yeah, but I already find looking at distros and specs to be super helpful on ProtonDB. Of course it isn’t going to be 100%, but if every person who has a problem with a game is using a certain GPU or distro it’s usually safe to assume that something about that is causing the issue