All private server is run by gold/bot company who bought server files from a thief.
By paying the ppl who run it not just going against some rules but committing punishable crime
in some country

If jm would like to could sue the company and everyone who is connected to them (via payments).
A lot of lineage2 servers were shut down (who run th official c1 server) when ncsoft decided
to go after them. (emu l2j servers are legit so those can't be touched)
Here on srf admins and mods decided to close the eyes over these private servers

Since they are not linked to them in any way other then the users who posts, and that is user
responsibility.
And guess if they would be asked by police or other legal authorities they would have to share
account/ip/user/all information of those who post that they payed/used any of the private servers.
Those servers got their own forums ......