It would be great if you could run a mastodon instance for yourself (1 user), entirely on a home computer. Similar to a peer to peer (p2p) network.
In other words, not be regulated by an unknown administration. Although, people can still choose to block any address (network regulation)
I realise that such a system wouldn't be server business model, but, it could be done. #software
Of course, when the computer was off, the person & posts wouldn't be accessible.