TSR's Super Smash Bros Thread|SWITCH HYPE TRAIN NOW BOARDING

[[robo9]]

I don't think you fully understand the how complicated copyright law is, especially when it comes to derivative work. Just by releasing a similar, conpetitive platform based fighting game after years of continued hacking and copyright infringement of Nintendo's intellectual property is more than enough for a lengthy, and definitely expensive legal battle if Nintendo so wished, especially if the game is commercial or seen as a direct competitor to their Smash game.

They're not worried because some random dude on the internet told them they're in a legal gray area, they've consulted with actual IP lawyers who without a doubt know copyright better than either you or I. If the professionals don't think the claim is baseless (which it isn't, btdubs) it's most likely not baseless.