Nintendo is well-known for suing for all kinds of incredible reasons.

You can sue someone for anything, and Nintendo is infamous for doing so. They will put an army of lawyers on a case that has no merit (or just enough merit not to be thrown out early) to cost the defendant lots of money or just create sufficient risk that the defendant will settle to avoid the slim chance that they lose.

Yes, our legal system has major flaws.

Nintendo literally uses people for playing their games in ways they don't like, regardless of if the user has actually broken any laws. They'll sue over people posting videos about games!

Are you familiar that half the memes about Nintendo about suing people over ridicolous violations of their IP?

How is pointing out incompatible hardware related to IP?

It isn't. The point is that it establishes that they are litigious.

There's a tier above them (Oracle, for instance), but they're pretty up there in their willingness to head to court not just with other big corporations but with individuals.