ISPs there are usually monopolies or duopolies so you run the risk of having to buy slower/pricier service, or being totally offline, if one shuts you off.
Thanks to restrictive firewalls, much incoming and outgoing traffic to services is tunneled over HTTP/HTTPS and uses the standard 80/443 ports. There are also legitimate reasons to have 80/443 open such as access to security systems, your home router, etc. They can't block incoming 80 or 443 without breaking a lot of things, so they won't. It's not the 90's anymore.
You really have to worry more about hitting your 1TB Comcast bandwidth cap.
The guy has less than 1Mbps upload bandwidth.
I don't particularly agree with it, but thats what it is.
If an ISP is concerned about traffic volume, take out the botnets hammering away at the doors — the occasional guy's private website getting slashdotted is small, temporary potatoes.
It does, however, have a policy against 'excessive usage', which is left conpletelt undefined and they have a policy of 'Acceptable Content' which is equally vague and ill-defined.
So I guess they do have recourse if i started hosting a pornsite and it became popular, but that's about it.