Originally Posted by
worldofneil
If SE wanted you to enforce 1 FC house per service account, per world, they would. At the very least they'd point you to the housing guide page or actually say something in-game about how it's only intended for you to have one FC house... but they don't.
So you can rage at this FC who owns 12 plots or whatever, but for all you know they haven't even seen that webpage or even been made aware that at one (very brief) time, there was a limitation. They went the buy the house, the game let them.