Co-op is using capitalism to fight some harmful effect of capitalism itself. Many Conmunist movements believe there are better and stronger alternatives.

This can be especially true for industries that are centralized by nature. You can’t set up production ready silicon factory or power plant today to set up a co-op. The more practical alternative is to set up union to protect rights of workers.

It isn’t communism, but sometimes making a co-op turns out to be more successful than forming union inside fragmented industry. A prominent example is amul from India. Instead of of forming union against highly capitalistic dairy industry, milk farmers and workers made a co-op that replaced those capitalist industries with market force.

The point was though this initiative got direct support from the government not some agenda against it.