Man that rule is such bullcrap. Imagine a photo editor that only allowed you to edit your own pictures and only those matching the app’s content rating.
If you’re new to it, maybe check out Katawa Shoujo: Re-Engineered. Same story but ported to be more modern under-the-hood. Apparently there’s even a web version thanks to Wasm!
Does that make sense in terms of DMCA and yuzu tho? youtube-dl got taken down for DMCA reasons on GitHub a while ago, while that was pretty much just bs. I haven’t looked too much into what yuzu does, but it seems like it’s just an emulator without any tools you’d need to also get it to run, to get the game data and some Switch (DRM?) keys. That’s comparable to browser cookies being used by youtube-dl to download websites’ media.
Also (to me) it more looks like the yuzu devs themselves made stupid choices to promote piracy, not really including the actual app code though
Definitely not using just the F-Droid app on your phone. Some apps utilizing adb might make installing .apk file(s) like this game on WearOS devices easier though