Yes, both Yuzu and Ryujinx were open source.

Ryujinx is licensed under MIT and Yuzu is under GPLv3.

I need to remind some people here who don’t seem to understand something.

Forks may be dead and development may not be as fast as the original.

However - you must think about the future and not the situation right now. Yuzu and Ryujinx sources will be invaluable information for people making emulators later down the line.

It’s a matter of when and not if someone picks it up again.