If I’m not mistaken, a large component of Nintendo’s power comes from Japanese copyright laws being far more pro-copyright holder and Nintendo uses it to its full potential. In Japan, this sometimes results in prison sentences and often big fines. it’s also applied outside the country against a consortium of universal copyright recognizing countries and so it can affect you regardless of your location although I forget how exactly.

To @AbsolutelyNotAVelociraptor@sh.itjust.works 's point, perhaps it is the weak qualifications for Japanese patents which have allowed Nintendo to bully everyone.