I don't have a problem with companies adding usage limits and whatnot, but it's shady to do for existing customers who have pre-paid for some amount of time. I

I don't have a problem with companies adding usage limits and whatnot, but it's shady to do for existing customers who have pre-paid for some amount of time. If I pay the yearly up-front amount, I expect my terms of use to stay the same for that entire year.