I’ve known a few in the U.S., and even worked at one. Maybe people won’t become billionaires doing this, but why wait for a complete overhaul of society to implement more of what are good ideas.
I’d also like to see more childcare co-ops, or community shared pre-k schools. Wheres the movement to build communities and pool resources around these business models in the US? In short, co-ops are the closest socialist/communist business model that’s actually implemented in the U.S., so why are more leftists not doing this?
You seem to be wondering why people aren’t starting an “easy” coop. Have you ever owned and operated a business of any sort? Why not try it yourself instead of speculating how easy it is for people to start and run a cooperative business?