See: Kaizo Mario directly inspiring Mario Maker.
See: LttP Randomizer, along with literally any other randomizer.
See: speedrunning streams literally making the market that Nintendo then sold the Nintendo World Championships cart into.
Nintendo absolutely benefits from this. They just want to crack the whip and take over. Fuck them.
Also, still can't buy Mother 3. Double fuck them. Tons of titles play better on emulation. I shouldn't have to justify it.
Oh well then it's good then that the software doesn't have keyfiles in it, and plays unsigned and self-signed homebrew and switch software just fine.