Even when I was living in a very liberal area, there were only a small handful of stores that advertised as worker co-ops. It’s funny too because those co-op stores were all incredibly popular and successful, so I don’t understand why they are so comparatively rare? The organizational structure seems simple to maintain, and has a high incentive for regular workers to go above and beyond since they directly benefit from the business being successful, so what’s the deal? I am speaking from a US centric view, so maybe things are different in Europe, but even with my limited knowledge I feel like they are relatively unpopular there too, but maybe not? I dunno.
Other people have given good answers in terms of the structural and financial reasons, but if you want to see an alternative there’s the example of this region of Italy where there’s a substantial number and % of coops. I believe this is due to preferential taxes and subsidies by their government, although I haven’t looked into it nearly enough to say anything conclusive.