I've been using Linux as daily driver for a couple of years now (EndeavourOS for the most part), but I still dual boot Windows even if I barely use it nowadays. VR still performs better on WIndows for me and I have relatives who refuse to switch and sometimes I troubleshoot for them.
I use Retroarch on Steam because it's very convenient. I sync saves on Steam Cloud and this way I can play on my PC and my Steam Deck without any hassle.
Nintendo has taken down fan-made games that were completely free, so it's not about them just making money. I think they've gone after Yuzu because it's the most popular Switch emulator and they were getting money directly from it. "Support us if you like our work" isn't the same as "support us...