[manquer]

Some ISPs do not count upload traffic towards the data caps. This encourages upload/seeding behaviour which results in higher % of local peers, reducing their cost and increasing user experience. From a networking perspective it makes sense as traffic is usually one way from DC towards user. If they can reshape it becomes efficient and cost effective.

Some universities had another way of doing something similar, torrents and similar services are for most part blocked within the network. However local file sharing services like DC++ thrived, the administration is well aware of this, but do not do anything. The few people who get content from outside share internally. Performance was great as sharing was effectively only WAN and the university saved on bandwidth