But that's one of the key problems with Android in general. It's billed as being "open," but the model Google uses is to put the software out there and let the mobile providers do the contracting. Since the mobile providers want lock-in, Android becomes open in name only, but in actual practice it's not what most people think of as open.
Unless you are a developer, in which case everything on the market is open to your skills, but most people are not developers. For the average consumer, Android is as open as Verizon (or whoever) wants it to be (hint: not much).