AT&T just sent notice of new terms of service and in the terms is this statement:
Looks like it's not just Comcast pissing people off anymore.
AT&T Uverse High Speed Internet throughput speeds may be temporarily reduced when a customer is using other U-verse services in a manner that requires high bandwidth. This could occur more often with higher speed Internet access products. It may be necessary, for some users, for AT&T to set a maximum downstream speed on a customer line to enhance the reliability and consistency of performance.
Looks like it's not just Comcast pissing people off anymore.