Sued for what? There is nothing Nintendo can sue for. Also we talked about Cease and Desist before, not sueing.

A c&d is a precursor of being sued. If you do not cease and desist, what is the result of that?

Also can you explain me, if you are right, why Nintendo didn’t do that with prior decompilation projects of Mario and Zelda games that reached 100% and are played on a variety of systems now?

I can explain to you, that Nintendo is famous for suing people implementing emulators of their platforms and is also going after things like palworld. It is new information to me, that these decompilation projects exist. I guess they are niche enough to not be interesting to nintendo right now. This does not remove all the other cases where nintendo went after people with lawsuits.