Yes ofc private sites have their own monitoring systems. But what about open site's. Can you imagine the fake postings on sites. How do we as a community filter fakes from all sites. This place would be full of i downloaded this and got that crap. To be honest its a horrible idea, WinMX is central programme, it is all contained, and as such can be protected far easier than loads of websites with hosts more interested in you clicking their web links than maintaining fakes.
As for the scanner you have seen thier is one big one, i can tell you the IP. And they have plenty of crap to deal with i can assure you. If everyone was patched they wouldn't be on the network, but sabre allowing prats with hostfiles on the network allows them to connect. And they have been doing the same thing since Kevin was running it, we inherited them.... And they have been on our blocklists since day 1 btw if anyone curious drop me a PM, if they was going to do something they would of done it by now, like back when kevin had it or KM. But as has already been quite rightly pointed out. The IP is a primary, it could be that IP doing the search, or 8-15 secondary's connected to it. Not really tangible enough evidence.