Every business has fine print like this when it advertises. I'm not sure what line of work inteller is in, but businesses have always done this. If consumers really cared, people would boycott t-mo for a week until the 8X and 810 users get the updates. Or all the other WP8 users would sign a petition or show some force. But, because no one will do that, consumers who buy the wrong device or service are at the seller's mercy. I'm sure MSFT, HTC and Nokia would like to update both phones, but t-mo contracted them to make those devices. HTC and Nokia dare not jeopardize current and future business deals by breaking contract and releasing this update for a few hundred (or whatever the low number is) of users. At least more people bought the 822 on VZW, so when VZW tried that no update garbage, people revolted and VZW pushed through the update. But that was on the #2 carrier in terms of size and subscribers. T-mo is growing its base and will chuck WP8 users aside for the iPhone and Android crowd. You saw how t-mo was bullying Blackberry.
THERE ARE NO REAL CONSEQUENCES COMING. There weren't any when MSFT went from WM 6.5 to WP7 and when they went from WP7 to WP8. People got left behind and nobody cared. That's the current structure we live in. Either you bend the rules to your advantage by buying unlocked phones and cutting the carriers out, or you buy a popular model. Or you take your business elsewhere.