Essentially people want a free social network that doesn't use its users data for mining and advertising, doesn't track user data, doesn't archive their messages if they delete them/their account/they die, and free from moderation. Is that really too much to ask for? The answer is yes - yes it is too much to ask for - you don't get a free service without paying for it in some other way - mostly these days through the…
I hear your argument. No VC-funded start-up is likely to make moves in this space. But your question ignores a whole sector of the economy: non-profits. I believe there even have been some non-profit social network attempts (perhaps even still active), though I can't recall their names.