Yuzu decrypts the games with your prod.keys which already means circumventing anti piracy measures. Pretty much all countries that care about piracy (EU and US) have anti-circumvention laws that make this action illegal, even if its for your own use of your own games. No matter how stupid it may sound, there is no possible way to ever use Yuzu in a legal way in most of the first world.
As long as someone is just running ROMs backed up from their own Switch cartridges and not distributing those ROMs, Yuzu can be used entirely legally.
Yuzu decrypts the games with your prod.keys which already means circumventing anti piracy measures. Pretty much all countries that care about piracy (EU and US) have anti-circumvention laws that make this action illegal, even if its for your own use of your own games. No matter how stupid it may sound, there is no possible way to ever use Yuzu in a legal way in most of the first world.