Comcast does business connections as well. This isn't hard to find: for example, if you visit comcast.com, its under "products".
Comcast does all sorts of business Internet connections including web hosting. I suspect they do in your area too, but you've probably never noticed (where do small businesses in your area get Internet access from?). Their cable business connections are delivered over similar (or maybe the same) infrastructure as the residential ones.
I use Comcast business at my workplace. I get a pretty good deal, actually an amazing deal compared to fiber with a zero install cost. 22/5 for around $150 or so. Their business support is competent.
Residential service is around $60 here. So for about double that you can get a 22/5 line without caps.
Comcast does all sorts of business Internet connections including web hosting. I suspect they do in your area too, but you've probably never noticed (where do small businesses in your area get Internet access from?). Their cable business connections are delivered over similar (or maybe the same) infrastructure as the residential ones.