Read other letters about this article
If you try to buy and view a movie over the Internet (instead of buying a movie via Comcast's own pay-per-view service), then Comcast may throttle you:
http://www.networkworld.com/news/2008/060408-comcast-traffic-management.html
New Comcast traffic management targets users, not protocols
ISP to slow traffic for individual customers who consume "disproportionate" amount of bandwidth
By Brad Reed , Network World , 06/04/2008Comcast announced this week that it will [...] slow Web traffic for individual users who consume a "disproportionate" amount of bandwidth.
[...]
A recent study by the Max Planck Institute for Software Systems showed that P2P traffic throttling was prevalent among cable company ISPs such as Comcast and Cox, and that all of the study's U.S.-based hosts that found their P2P traffic blocked were located on cable networks.
- - Network World, Wednesday, June 4, 2008
In other words, some ISPs (Internet Service Providers) have discovered a technical necessity to throttle video traffic.
And all of the ISPs who have discovered such a technical necessity just happen to be in the business of selling video content.