Not true. They filled a lawsuit against Yuzu and Citra and the developers had to pay 2.4 million dollars to Nintendo. They probably threatened the Ryujinx dev to do the same.

They could start by making the Steam client be able to run in native Wayland

Yes, but that would be a lot less efficient. With a dielectric mirror you can get easily 99.9% of the maximum momentum gain from the light, while with a solar powered laser you would get for the emission the compounded efficiency of the solar panel + storage + laser, so way below 10%. So you would gain around 10 times more impulse from your solar panel absorbing light than from the actual laser.

The final momentum gain is a bit different as the maximum you can gain from a photon is double its momentum (because you can reflect it back with opposite direction).