The cable internet business is pretty much a monopoly in all but name. The biggest provider is Comcast followed by other smaller ones. You basically have minimal choices.This sounds awful. I'm surprised there isn't a provider looking to change the rules of the game and become the most popular one just by removing the cap, as it happened in Europe quite some time ago. I remember when I lived in Belgium there was this same thing, and I thought it was plain extortion. And that was before games were 100GB big, indeed.
Also Comcast loves to raise prices and charge for every little extra you need. The cap started at 250 GB and slowly got larger over the years, but it's still pure bullshit.
Last year we had no cap but they rolled out a 750 gb cap. I have four people constantly streaming games, movies and of course using torrents and site downloading.
Netflix and Steam/GOG eats the majority of the cap.
When you reach the cap and go over you get a warning, then you get charged for more data. If not your internet is cut and you have to beg to get turned back on.
They basically force you to pay more just to get unlimited usage with lame reasons. The only other option are two smaller providers with lower caps and speeds.
So yes this is a bigger problem then most think.