> Honestly, I think it was probably a few users abusing the system like crazy.

It's not unusual that 10% of users use up 80% of the capacity; first saw this when home internet started getting ubiquitous.

By dropping the problematic 10%, the remaining 90% are:

a. Much happier, and

b. Much more profitable for the provider.

Resulting in a sustainable service for those who don't abuse the hell out o the ToS/FUP.