Dear Lord, I had no idea one could be so lost and still be so confident when making an argument.

I am not trying to be mean, it’s just that you are arguing against things that are completely made up.

So instead of one admin being able to take it all down we have multiple

Shared ownership is a policy to prevent single-points-of-failure. Every large-ish instance has multiple admins. This is even a requirement in the Mastodon Covenant: your instance is only listed on the joinmastodon site if the instance has at least two people who can independently access the admin panel.

Could go and notarize shared ownership of a bare metal server I suppose?

You don’t need any of that. As long as the collective has control over the domains and that backups are created and available for everyone, admins could simply move the instance to a new place with a new deployment and a DNS change.

It does not mean that every admins needs to have direct access to the server, and it does not mean that the server will go down if one of them goes rogue. Every minimally competent organization has security processes in place to avoid that.

But we have multiple admins, so these instances would be uniquely able to process very large numbers of users on account of having more than one admin?

I can’t even imagine how you go to this non-sequitur. The idea of having multiple admins is only to ensure that these instances are not under control of a single individual and would not be represent a systemic risk to the overall Fediverse.

If you want communities to be resistant to server removal

Another non-sequitur.

So that even if the original instance is gone, everyone keeps interacting with their local federated community-copy

How is that working out for the communities on feddit.de, and the many other instances that disappeared in the last year? Did you notice there are gone?

In particular because that still doesn’t solve the problem because now you got people able to either moderate each others copy

Another non-sequitur. Are you sure you have a clear understanding of how federation works?