From AT&T's answer, you finally know why all those applications are a problem: AT&T and Apple discussed a proposed iPhone application from MobiTV and CBS that

From AT&T's answer, you finally know why all those applications are a problem: AT&T and Apple discussed a proposed iPhone application from MobiTV and CBS that was designed to stream live video and audio from the NCAA men’s basketball tournament. AT&T and Apple discussed the likelihood that such an application could cause substantial network congestion and degradation of service for certain customers on AT&T’s 3G network, especially customers accessing cell sites located near colleges involved in the tournament.