Don't be mistaken, when running a couple of ultrapeers you don't have to browse users individually. You can just leave the ultrapeer running and collect data on thousands of users within just a couple of hours and that's what companies like Overpeer and Mediaforce are doing all the time. Not a single company searching the network for copyright infringements uses the browse host functionality.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob