I'd wager this is the prevent folks from streaming over 480p on the standard 'unlimited' plan, prevent unauthorized hotspot use, prevent hiding DNS for data har

I'd wager this is the prevent folks from streaming over 480p on the standard 'unlimited' plan, prevent unauthorized hotspot use, prevent hiding DNS for data harvesting, and a few other things. What would make more sense is simply to charge this at hotspot rates, since they can't determine if you're using more phone and low-res streaming bandwidth than your plan permits.