There are many emulators for nintendo consoles. Very few are taken down by legal actions, because it is legal to develop an emulator. Hardware is functional and cannot be copyrighted.
Yuzu's problem was they supported piracy. They made special patches of the emulator to play leaked games which they sold through patreon. That's how you get sued for piracy.
Ryujinx does not allow discussions of piracy, commercial ROMs, or firmware on any of their own platforms. The emulator can play commercial games, but they only link to instructions on how to dump your own cartridges and firmware from legally purchased sources.
That is how smart developers protect themselves from lawsuits. It has worked for Dolphin, and many other emulators. Ryujinx will probably be just as safe.