Imagine what the mobile landscape will have been like had AT&T had bought T-Mobile, wiped out a potential pain-in-the-ass that it has become for AT&T and Verizon. Sure, Verizon had been able to keep prices high due to its better coverage and AT&T simply charging whatever it wanted because it had many flagship devices in its mobile arsenal. No longer.
Under the stewardship of John Legere, T-Mobile is a growing threat to the once indomitable duopoly. Not only has it continued to grow faster than its competitors, it's stealing subscribers from bigger competitors. Hence, this explains the sudden generosity expressed by the duopoly.
VZW has increased data allotment by 50 to 66% depending on the pay tier. This followed a similar increase form AT&T.
Make no mistake, some companies would gladly continue to bleed us dry. And if given a chance, T-Mobile may someday do just that. For now, the adage, "the enemy of my enemy is my friend" works just fine with us mobile warriors.