Inviting a friend isn't illegal, I've recruited one or two myself. However, when 38 out of 50 nobles in your 3-region realm all consistently move within 2 hours of turn change, then there's something fishy going on. No such thing as that much coincidence, take it from a former multi-cheater.
If you count that these 2h are when usually most players log in the game, then it is not that fishy or suspicious...
I´m not defending multi-cheaters or the realm, I just tought I could add somethings on why most players in Averoth think the GM´s, the Dev team members, and/or the Titans are using OOC things to win a IC war.