Yuzu doesn't ship with prod.keys. You need to provide them from your legally ripped switch. And the guides outline that (https://yuzu-emu.org/help/quickstart/#dumping-decryption-keys). Nintendo needs to go after sites that provide those keys, not Yuzu...
Yuzu doesn't provide them... Yuzu goes out of it's way to tell you how to get them legally. I'm not sure that Yuzu has circumvented anything.
Nintendo could have a claim against tools like Hekate, since that's the tool that has to decrypt stuff to dump it. But I'm not sure that would fly either.