this HN comment at the top illustrates the perspective:

worker-owned cooperatives have not taken over the market, although they are an available institutional form, because (a) they find it hard to raise capital (b) they tend to make decisions that maximize worker welfare rather than profit,

In other words, The market system as it currently exists maximizes profit over worker welfare, and that’s why these coops are not successful. That’s a fairly damning indictment of the market.