me and a couple people spent a long while trying to think of a cool new freebuild idea, which revolved around getting points from what you build and using those points to build in new areas etc, but it was abandoned simply because it felt too complicated, and since the areas you could build in were all closed off, we thought it would make players feel restricted and it also kinda spreads people out a bit, getting rid of the 'talking and chilling with friends' factor out of it, making it pretty identical to singleplayer building, but even worse.
infact the house freebuild (freebuild where you build in a giant modter house) we were hosting had this same issue, and that's also why we closed it down. it just kept people too far away from eachover and it didn't feel as multiplayer as it could've been, and people seemed to get bored of the whole idea pretty quickly.
now I've just 'given up' and I'm just hosting regularish freebuilds every once in a while, whenever I feel like doing it