Hi. I'm the guy that tipped HaD off to these things.
Tilde communities predate the Tildes 'service.' and is effectivly a return/recreation of the pre-graphical web service model of 'you're connecting with a specific machine and using its services.'
No it isn't for everyone, and sadly no while most have email services gmail, icloud, etc refuse to interact with them.
I like it, but I'm functionally insane. It gives me a place to post static sites and my gemini based blog.
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https://ctrl-c.club/~singletona082
gemini://gemini.ctrl-c.club/~singletona082