There aren't more of them because they have a hell of a time securing financing when most businesses are financed through equity sales which they can't do.
> most businesses are financed through equity sales
Maybe once we've seen a few hundred of these come and go it'll be time for a general theory of their kind.
2B people spent better part of 20th century doing the experiments, killing tens of millions of those who didn’t completely shared the ideas of the collective, and you think it is premature?
General theory is in the Das Kapital. So far the things have worked as described. People by mistake ascribe happiness to the outcomes calculated there while there is no such happiness predicted by that theory. Ie communism isn’t a happy place like some naïve readers think, communism is prison and oppression.
Surely the USSR is an example of the pigs pulling a bait and switch rather than communism.
The failure of the USSR to achieve communism is a side show to all the variations on worker | producer collectives that didn't fall to Stalinism.
Or have you worked there and this is first hand?
If anything the current situation stands to worsen that situation with smart young people who might contribute to a better future dying or fleeing.