It's easy. Private servers aren't allowed period technically. Sega could get the servers down any time they want cause it violates the ToS and such. If they really wanted they could sue off the hosts.
Thing is, they don't, someone tried to get that server down once by reporting it to Sega which took no action at all lol.
Either way due to it being against the ToS and such and other stuff, PSO-World doesn't want to get in any trouble so they simply forbid spreading info and such about the private servers. You can't talk directly about it either iirc.
More info can be read here: http://www.pso-world.com/forums/showthread.php?t=72843
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