There is also a homebrew channel for 3DS and for Switch although hacking those is a bit more involved process than the Wii was.
I don't have a switch yet, so I'm not super familiar with hacking it, but Plailect has made a full guide for hacking a 3DS here https://3ds.hacks.guide/
And, ofc, it allows piracy as well as homebrew. My personal favorite thing to do is use a virtual console injector(gbatemp.net) on my PC to create custom virtual console ROMhacks. The Super Metroid randomizer(dessyreqt.github.io) and A Link to the Past randomizer(vt.alttp.run) ROMS can both be injected and played on the go.
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