And here is the official
Xfinity policy for residential use of VPNs:Can I use a VPN connection on the XFINITY Internet service?
Comcast permits the use of VPN connections so long as they are used in accordance with our applicable terms of service and policies, including, but not limited to, solely for your personal, non-commercial use. Comcast does not provide technical or other support for VPN connections. For help setting up, using, or troubleshooting your VPN connection, please contact your VPN provider.
There is of course, no such non-commercial use restriction for business class service.--
History does not long entrust the care of freedom to the weak or the timid.
-- Dwight D. Eisenhower
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
-- Thomas Jefferson