The country is Austria, and im not quite sure if there are any sources on this law on english. And you're right, i'm not an expert on laws, but there has been a lot of controversy regarding this law, as it was originally designed to prosecute the mafia. It has only been used once - to hunt down some animal right activists, who trespassed into animal factories, to film illegal treatment of animals. They were sued under this law, as they prosecutor used the law in a way that he declared the whole animal right group as a group that came together to engage in illegal activities. This law, its loosely definition of "illegal activities" and the use against a harmless group of animal rights activists (remember it was enacted to get rid of the mafia) casued a lot of controversy in my country. This law is planned to be changed by the government. But until this point ANY group of people that do something illegal can be (theoretically) prosecuted under this law. Of course its highly unlikely that this will happen to any private server, but my whole point was that there are places on the earth where playing on such a server can get you in troubles.
So while i'm no layer myself, i've spent a lot of time on this subject, and its something incredibly stupid... but its still a thing here...