Well technically each user could have their own instance if they choose to do so. They’d be free to interact with who they choose to interact with and block who they wouldn’t want to interact with. They’d be free from any outside hierarchy. Many user choose not to do this, but that doesn’t mean the system is inherently hierarchical.
(I’m excluding the fact that not every user has the capital to host an instance)
I think you’re describing anomy, the absence of norms and rules?