Serious question: why don't these communities 'succeed' then. Meaning, why don't they keep existing for decades, and why don't more people get interested in this way of living?

The lure of modern society is difficult to resist: most kids would rather live in the suburbs, play video games, and scroll social media than be sequestered on a remote farm with sparse accommodations.

A close approximation may be the Amish or Mennonites. It's a difficult life, and not prone to explosive growth.

Someone has to actually produce what they need.

do you mean like half of the worldwide population [0]? or anything on top of that like remote villages anywhere in the world that aren't liberal like hippies but are very much tied to pastoral ways of living? heck if back in 1600 we didn't killed dozens of millions of people maybe this type of communities would be much more widespread

[0] https://blogs.worldbank.org/en/developmenttalk/half-global-p...

Some of them do, like Black Bear Ranch. I’d wager that there are more that just don’t advertise.

Because family brings vurnersbility and vurnersbility brings dependence on stability aka conservatism. The phase of life you start into with one another transports you right into adulthood and responsibility. And some just dont grow up to that. Some eternally leech on others. And all the nice words and good intent wont fix that.