With some trickery you only need the MS account for setup. You can also transfer the key to a completely new system. With a bit more time to prune services/app

With some trickery you only need the MS account for setup. You can also transfer the key to a completely new system. With a bit more time to prune services/apps and set up something like simplewall to block everything else, you have a pretty decent setup. Sure, it's not FOSS, but neither is Steam or any of those games. Looking at my personal selection of long-tail games, about 1/3 work perfectly on Linux, another 1/3 don't work at all, and the last 1/3 have various levels of yak-shaving tweaking settings before they run well. That last 1/3 is why I went back to Windows years ago.