- Sony has a track record of removing purchased media en masse, while Valve does not.

- While it could be argued that Valve runs an effective monopoly of the PC platform based on their marketshare, Valve operates on a platform with competitive options including DRM-free stores.

- Game consoles have always been more attached to physical media than PCs.

- Sony is the largest player in the market (disregarding mobile phone gaming) with more total marketshare than Valve and the PC platform. This makes them a much more visible target.