Yeah I know, still baffles me though. I can't imagine life without unlimited, I'm 21 and I think I've almost always had it.
A lot of internet providers in the US want to get rid of unlimited. I know on the list of major internet providers the one we have is one of the few that doesn't have a cap at all (Frontier Fios). I know Verizon Fios has one and Comcast has one as well as several others.
And sadly I know Comcast also has a monopoly in a lot of areas. We got lucky Verizon was trying out Fios in our area so our street got it (yes, our street, everyone else around can't get it. My friend lives 5 minutes away and her only option is Comcast). And then Verizon wanted out of our area so sold it to Frontier.
And that's part of the problem here. Many areas internet providers have a monopoly going on (hell, even Frontier where we are the alternative is Comcast...).
Really they need to classify internet as a utility here because with so much land space in the US, you're probably not going to get a lot of competition in one area (so much area to cover it makes more sense for companies to cover different areas than all try to cover all areas. Probably just isn't feasable for any one company to try to cover every area). So they need more regulation to keep the companies in check.