>I'm not aware of any large ISP that has throttles or bandwidth caps (comcast has a supposed 300GB cap but has never to this day enforced it).

Then you haven't been paying attention[1]. I live in one of these areas, and have already been getting 1-2 robocalls a day this month about my data usage. They're calling it a "trial", but the costs are very real, and it's all in place to go national when people here don't complain enough. If I go over in the next two months, I will start getting hit with that charge.

[1] https://customer.comcast.com/help-and-support/internet/data-...