However, your example does not apply to the issue because it is too broad with lots of competitors. Most areas in the U.S. only have ONE broad band provider in each area. Then the provider would do whatever it can to get itself to be the ONLY one in the area; thus, there is NO competition. Allowing no price cap in this case actually opens a can of worm. The no-limit cap could work if and only if there is a competition.
It seems to me that the imposition of price caps acts as a barrier to new competitors. It's just another form of rent control. With the pricing cap gone, prices would almost certainly rise in the short term, and this would lure new providers into the marketplace. This is exactly what happened to American oil producers when world oil prices rose sharply a couple years ago.