It's according to game and also Nintendo games. Not sure if others are illegal too.
I'd say that piracy is more of a victimless crime (most of the time, if it's from an indie dev that may struggle to get money it's actually making a victim) but a crime nonetheless. Acting as if it's not one doesn't help. We're aware of what we're doing at least.As the DnD rouge would say it would not be a crime if there was not witness alive. hehe
Emulation is fine if there's 0 bios nor private code.Like everywhere emulation and downloading roms is a very gray area.