You can't fault them for trying

Apparently T-Mobile is going to make their own AppStore, but it'll be for the entire carrier instead of just one phone.

And they probably think 1000x the phones means 1000x the profit. I see 1000x the complexity. Or at least 5x the complexity considering that's the number of different platforms.  Plus some multiplier because dealing with two platforms is more than twice as hard as only handling one.

Imagine the AppStore launch with ten times the delay and ten times the complexity and bugs. With no killer phone.