I agree to most of the points. p2p solutions only can be brought sucessfully to live, when the comuniti making up the p2p network is happy. No campaign can ever leverage that!
a note on your view for IP-adresses. All nodes are visible in a simple map, so it would not take long to trace where they are, and who are behind them if some one wanted, so in that respect engaging in SIA is not private at all..