Thankfully, most companies kinda turn a blind eye to piracy of their back catalog. It’s really mostly Nintendo that gets all bent out of shape about it, and, honestly, they bring it on themselves for essentially vaulting many of their classics(like most of their GameCube games, for example). It really doesn’t help they they slow drip the releases so that only the same old few games are available at launch(I don’t want to play Clu Clu Land or Urban Champion, Nintendo… and I’m someone who likes those black box NES games more than most). Hopefully Nintendo Online solved that issue, but I doubt it.
Anyway, it’s not like anyone is going to miss, say, Major Minor’s Majestic March for Wii. I would like to encourage companies to release more of their stuff, but realistically, it’s out there for anyone savvy enough to get it. We need to fix this stupid broken copyright system.