The telcos only enforce the server rule if you are causing problems like doing something illegal, torrenting, or maxing out your bandwidth 24/7. I’ve had multiple servers running over the years and never had any issues with Comcast or AT&T.
Generally they don’t care if it’s for personal use. I’ve heard of them shutting people down for something they saw as business related. They didn’t really get shut down, it was more like a friendly “We see what you’re doing and a business plan would allow you to do it for $30 more a month”.