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?
A close approximation may be the Amish or Mennonites. It's a difficult life, and not prone to explosive growth.
[0] https://blogs.worldbank.org/en/developmenttalk/half-global-p...
they either implode or get so successful that they assimilate and morph… The early US was rife with utopian societies whose stories are legion, onieda and the mormons to name two contrasting early examples. More modern and infamous inline with the time period of this post is drop city… they got too successful as they were a stop on the way out to sf but they went onto do great things.