Comcast used to do a lot of messed up stuff. As I mentioned in a comment somewhere close to here, I've been a customer long enough to have seen those bad days and how they've managed to change since those days.
That's aside from all the political shenanigans they pull, trying to kill municipal broadband and net neutrality. There's scarcely a more evil ISP.
I switched away from Comcast as quickly as I could, and never had trouble with either smaller cable companies or fiber providers.