You don’t have to take Nintendo’s code to make homebrew and stuff, its just easier. Ideally devs would have looked at what the apps did and reproduced the functionality, without copying the exact code. Doing it this way opens them up to DMCA claims in a way doing it properly wouldn’t.

Like all the homebrew stuff for switch, if Nintendo could take it down they would. But they can’t, it doesn’t include copywritten code of theirs.

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I think superliminal would be a good time high, easy enough and already a bit trippy.

https://www.ziperto.com/ is usually where I grab my rom files from. Switch emulation with https://citron-emu.org/ is similarly $0 (apparently switch emulation works a bit better then cemu on android, although I haven’t tested both).