Are you telling me that I’m reading this wrong?

https://www.eurogamer.net/did-nintendo-download-a-mario-rom-and-sell-it-back-to-us

They’ve taken ROMs and sold them to people, it was confirmed some time back. Idk about the emulators, but it would stand to reason that, given they support the ROMs, they’ve at least looked at other emulators’ source code for ideas