Back in the early 2000s we were consulting to a lot of universities and other organisations seeking solutions for this. We were helping them deploy middle boxes such as those from Packetshaper, F5 and the like. And because universities had a "no censorship" expectation from academics and students, what the IT administrators liked was the ability to detect and shape the traffic that was considered hogging bandwidth needlessly. That way they weren't blocking Napster, LimeWire, and the like but just slowing it down so that miscreants went home and used their own ISP connection rather than the organisation.