If a fan made this and hosted the web frontend to the contract on ipfs (initially hosted just by nodes behind Tor, and then pinned/rehosted by many users), then Nintendo would have a very hard time taking it down, even if the original creator was known to them.

Indeed, it would be nice to actually test the censorship resistance of these platforms. Although it will have to get quite big for Nintendo etc. to care. Then you have the side-channel attacks or rather entry attacks, where it would be easier to take down any mobile apps that use this as a backend. We shall see.