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This is just opinion, but it might be close to the truth. I reckon that...

The reason BayTSP can get on Direct Connect is because of a few mods to the open source DC++ or because of 3rd party search bots (like GloSearch) making the job easy for 'em. The reason BayTSP can get on KaZaA is because there's a few skiddiot projects already out there for the FastTrack protocol (you can even find programs that interract with KaZaA users on planetsourcecode.com) The reason BayTSP can get on Hotline is because the whole protocol is very well documented by 'Virtual' and there is also source code available for this. EDonkey - Emule? And the Gnutella networks, well, I'm pretty sure there's open source code out there too.

One thing I am curious about though, is whether they are illegally using open-source code for profit despite any policies laid down for the employment of that code?

Bunch of opinions and a question that'll probably never be answered but if I can insinuate that BayTSP are lamers who steal code, it's probably been worth it. :;)

Open source is good, but sometimes it helps the wrong people, I reckon that's why BayTSP can check so many protocols now!! Just a thought?!? :(