But nothing needs to be done to meet this OPs desires for community only instances that are well federated with other instances (IE at least one user is subscribed to each community on each instance). This way those admins just manage those communities and Beehaw and Lemmy.ml can run their combined servers.
The users and the subscribed to communities cause nearly all the load on the servers too, it is a way to keep costs down.
I mean that is what is is asking, he is looking for a team of people to manage the instances in this post. That is what this post is about, he is looking for a team of people to run them as admins while maintaining his (imo correct) vision for how it should be structured.
I forgot to mention the biggest fact- the users are where all the risk are. If people are just posting pictures to your instance of communities you have minimized risk as you can just gatekeep what is posted. Once you allow users in who can then post on other federated communities you take on a lot more risk.