I don't know what the rest of the country looks like, but I have home Comcast in the US and have been self-hosting a server on port 80 with a similar more-or-le

I don't know what the rest of the country looks like, but I have home Comcast in the US and have been self-hosting a server on port 80 with a similar more-or-less static IP as you've described for well-over a decade. Many of my friends have the same setup. It never even occurred to me that Comcast cared. All ports are open (maybe not 25, I haven't checked.) I guess the terms of service allows them to shut someone down if they felt like it, but I wouldn't really worry about it. If you have a site that generates so much traffic they even took notice, I presume you'd want to be on a real hosted environment anyway.