Somebody has fed you or you have invented bad information. Neither Yuzu nor Ryujinx, the two Switch emulators which recently ceased development due to intervention from Nintendo, included Nintendo's code. The Yuzu settlement required those developers to acknowledge that
because our projects can circumvent Nintendo’s technological protection measures and allow users to play games outside of authorized hardware, they have led to extensive piracy.
There was never any mention of them stealing Nintendo code.
Ryujinx, we know even less about, because the agreement went down privately, but there's literally zero indication of any stolen code. We know that Nintendo contacted the developer proposing that they cease offering Ryujinx and they did.
Obviously, Nintendo was bothered in both of these cases because the emulators do facilitate piracy, but that's not the same as them having infringed on Nintendo's copyright by using their code which you are claiming. Both of these emulators were developed open-source; if they were built using stolen Nintendo code there would be receipts all over the place. That was never the problem.
I definitely hope we get more backstory to William/Billy. I think the big question hanging over the series now besides Tommy is ...
spoiler
Why is Billy "evil"? It doesn't seem like killing Livia and Jen served any real purpose. I guess it's supposed to read as something he did accidentally in a burst of temper, but that's not much better. I get the sense that the show still wants the audience to like him or they wouldn't be spending time on introducing his sweet boyfriend. But even with Agatha guilting him about it, we didn't see much in the way of remorse. I think the show is too well-written to just have him be evil because he just is.For what it's worth, I'm not at all convinced that Livia and Jen (or Alice, or even Sharon/Mrs. Hart) are or will stay dead, so maybe that's the redemption arc. Perhaps at the end of the road, when Billy finds what he's missing, it's not Tommy but the lost members of the coven. Nice to get the payoff to the call-forward "A lot happened to me at 13, too."