But Yuzu is not the thing that decrypts it. They're saying that the fact you're using Yuzu means that someone somewhere has done something illegally, and that Yuzu should be held accountable for other people doing other things.

I'm fairly sure that's a thing, too, lol. I went to buy a printer recently and couldn't find a decent one in my price range because they're all essentially leased nowadays. It seems you have to use their ink and you can only get it via monthly subscription. Even if your cartridge had ink left in it, you wouldn't be able to print with it unless you had enough page credits. Fuck that.