:You have a point, but I think that those external DRM schemes are largely issues with the publishers, not Steam or Valve. One of the things that Valve pushes in its advertising to publishers is its self-contained DRM scheme, but it's apparently not enough for a few publishers. Steam notifies users on the Store pages if it comes with a 3rd party DRM scheme, and if a user does exceed an install limit, they can still call the publisher to request an additional activation (which is not relevant to this article). This issue might deserve a mention, but I think, for the most part, it's not ubiquitous enough to warrant a significant amount of coverage. –