I think you're missing that this is as much a social technology as a computing technology. Immediate analogy would be stuff like the 'open space' model adopted from anarchist organising into design thinking. Which unfortunately lost its function in the transition. Moving from being a way of generating and consolidating multiple perspectives / ideas / intentions, into a way of generating engagement without influence on a projects direction.

It doesn't seem like the effort here is to keep out any group, but rather to maintain a cohesive structure to the technical and group work aspects of it. Social technologies can be as brittle as they are useful, and abstracting / commodifying them can often make them work in a way that directly undermines their creators intentions.