https://arstechnica.com/tech-policy/2018/06/comcast-says-it-doesnt-throttle-heaviest-internet-users-anymore/

Comcast has disabled a throttling system that it deployed in 2008 in order to slow down heavy Internet users.

Comcast's network is now strong enough that a congestion management system isn't needed, the company says. The system has been "essentially inactive for more than a year," and is now disabled entirely.