Firstly, such a site will require far more resources than it is fair to ask a free host to provide you with.
Secondly, and most importantly, if publishing the statistics of peer to peer networks isn't encouragement then I'm the king of england .....
Your idea is the wrong side of legal, the urban myth that you can only be prosecuted for having direct links to illegal files is exactly that an urban myth, you will be infact aiding and abetting ( not to mention mining statistical data on ) the activities of criminals, which is infact illegal, in more ways than one.