People speculate 'the money', and I have to agree. This isn't a tech problem, as in, it was working last month, and gone this month. Basically, what incentive is there to let people play what they already own, when you can charge them for their 10th copy of Skyrim for Geforce. To name and shame, Bethesda and Activision Blizzard. Ubisoft is pretty nearly keeping it alive at this point.
According to one of the authors of The Long Dark, which has also been pulled, it's because NVidia didn't bother asking, they just... put it online (source: https://twitter.com/RaphLife/status/1234181315840229376). Apparently they offered a graphics card by way of compensation, so...
Do you disagree? Why do they need permission? You own the game on Steam, or buy it on Steam, and they just give you a VM to play it on. I don't need their permission to get a new computer, do I?
I'm not invested one way or another, and I certainly don't know what the legal position is. It does, however, suggest that Nvidia are rather vulnerable to any one of Microsoft, Steam, or game dev/publishers putting them under the microscope.
