I don't think it really has much to do with DRM. It's practically well known at this point that consoles are easy to pirate through emulation. Especially with the constant day 1 emulation articles
So just a roundabout way to keep people from emulating games? People are gonna figure out how to relate your games. We took many years but we can finally emulate Banjo Tooie. Good games sell well and don't lose really to piracy, bad (lazily made) games deserve to be pirated