I'm curious myself if there were any formal requests or warnings received, regardless, it is the safest move for the forum and its members, so not a bad decision. IIWII.
~At most, I'd guess the forum could get some formal legal request to ban or remove certain things from the site and/or maybe banning any participants that continue to advertise for a particular service which has been deemed illegal by the country the forum is hosted at, but I wouldn't see the forum itself in any big risk, as theymos would probably comply if it is related to advertising. That said, I'm not a lawyer.~