I had made a suggestion that they enforce only one personal and FC plot per world and they have 45 days to choose which ones to keep. Then they are refunded the entire cost of the plot once their extra plots are demolished and that would eliminate the majority of submarine shacks on Dynamis where 4 people own entire wards. For those that don't choose, then the game chooses at random for them. 45 days is plenty enough time to choose which plots you want to keep.