Creative has been connected to the rest of the universe. Devs would have to block chat, block warping to other players, block the friends list, block portals of any kind, hide the planet from other players, etc.
For now, the game is an MMO. If they ever make a local/single player, downloadable version, then players that can’t participate due to whatever reason, would be able to play the game by themselves.
Wonderstuck holds all rights to the game/software and reserves the right/ability to revoke access to anyone, for any reason, at anytime.
The only thing a banned player could do is appeal their ban support@turbulenz.com - unless they already have & it was denied.