As others have said repeatedly, this kind of thing isn’t new
or special. It’s been around since the advent of MMOs in the early 90s, and those MMOs inherited it from earlier MUDS.
Whenever you can have destructible/stealable/lootable assets in the game world, and the game permits asymmetrical PvP, you get the situation you describe. It might be new to
you, because you've avoided such games in the past, or because Chris Roberts and his shills have sold you some cockamamy story about how it's new and special, but again it is neither new
nor special.
If you want to read about exactly thing you’re talking about in another online game, with the added twist that nothing despawns when you log out, read
@old Duck’s
"Space Engineers, 'Open' changes everything” thread, and the efforts he's taken to remain "under the radar" as he builds his first ship. Heck, Keen's
official servers even fit the technical definition of MMO I'm familiar with: more than eight players connected simultaneously via a WAN or the internet.