+Yes but ... wouldn't M$ engage in court procedure for protecting it's IP against Minetest ? (a name change would be enough though... )

Anyway I think they lost it already with Sony's Landmark (fork of next Everquest, appears in beta in wich beta users invented functions that were not available through glitch usage, they even now function as some sort of cast of wizards with voxels... )

15 years ago, I drafted such a game with friends, around the same kinds of ideas and voxels space games that were existing at that time (remember Magic Carpet ..? )
Of course it never took of, as finding the ressources at that time was as hard as now in Belgium, and without crowdfunding ;) ...