Comcast is the most hated company in the U.S.  They're rated the absolute bottom of customer support and service quality.  Unfortunately, they're usually a regional monopoly, and 80% of the U.S. has no other choice but to use them, which is why they can get away with having the absolute worst customer and service experience.  Ridiculous prices for equally ridiculously slow service.

If Comcast knew you were setting up a server of any type on a non-business account, they'd probably fine you on your next bill, then cancel your account the following week.  It's against their Terms of Service to run any type of "server."