Re: Speed is not the whole story
There are a few that do have caps in the US, AT&T and Xfinity (Comcast), but their cap is 1 TB and they also have unlimited plans that cost more. But most do not. I have Spectrum cable at 400 Mbps for $70 / month and it is unlimited.
The internet divide is very real here. In most (all?) cities 1 Gbps is available and 100 Mbps is the cheap level, usually around $50 and discounted to $30 or so if getting TV and landline with it. If you live in a rural area your options are severely limited, slow, and very expensive or even non-existent. The mean for the US is down around 70 Mbps due to the slow speeds in rural areas where only satellite service is available.