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When you get a house or an apartment or a shack in the woods -
it immediately comes with a complete private cloud & smart-home server preinstalled.
All you have to do is configure it with your users' details and link it to your own (permament, cryptographically secure) <IPv6 address | blockchain address | GPG keys | combination of the aforementioned>, which have replaced cellphone numbers.
Self-hosting is the default.