Greedy bastards. This is more common with cellular connections/hot spots etc to limit bandwidth usage. Most likely a smaller operator (or simply greedy) that has limited downlinks/uplinks so this is their way of controlling usage/restricting access.
Like finder said their are some threads that discuss work arounds. You can also do some googling as their are a few videos on youtube as well as some different guides out their, however depending on the restrictions imposed you may also find some ports blocked and restricted as well, so even if you get linked up they may block large blocks of ports to assure video, etc is not passed. (similar to what some employers do with their firewalls.)