I would object on the grounds that your original contract with them contained no such "capping clause", and they can't arbitrarily "change the rules" once the game has begun.

I mean, what's to keep them from changing the cap to any random value, such as 100 MB, or even 12K? If they get away with this current foray into "initializing the cap", you can bet your bottom dollar the cap rate will decrease (less downloading) and the penalties/cost will increase.

I ditched Comcast long ago for Verizon, then even they started adding "price creep" and hidden charges to my bill.

I jumped ship with them, and went with Clear.

Down with bandwidth metrics!