mtbc | Worthwhile anonymous peer-to-peer

Our home Internet connection typically has some spare bandwidth and it occurs to me that I could donate a portion to running a peer-to-peer network node. I would probably quite like to support some network that offers state-of-the-art anonymity but there's the whole issue of how one actually uses such technologies: I would quite like to assist civil liberties campaigners in totalitarian states but I would rather not provide copyright-violating movie downloads and aid the circulation of child pornography. I don't know if the features or culture of some networks tends to bring them different kinds of user or use. I wonder if adding a node to any in particular would on balance be a moral good, enough to make it worth the cost.