Do they have a patreon? I think part of Nintendo’s extermination policy is “if you try to make money from it, it’s lost revenue, and we will murder you.” For example dolphin has been around forever, but always open source and without a patreon or the like
EDIT:
Answered my own question
RIP
But yuzu is open source as well: https://github.com/yuzu-emu/yuzu
My guess is they are just tackling one thing at a time, and ryujinx is next on their chopping block. It’s entirely possible they’ve already sent cease and desist notices to to ryujinx