@thisismissem technically that’s a formal structure. But it may in fact be helpful in some cases for orgs to have formal structures like membership shares in a co-op.
I don’t actually think that’s going to happen other than in niche areas but it very much depends on the Fediverse server model.
A services org that specializes in hosting?
Are there moderation as a service entities?
There are a handful of co-ops that specialize in eg Wordpress or Drupal hosting and that’s about it.