The government funding is really key here. We would be seeing communists constantly starting co-ops if seed money wasn’t a barrier. That’s not to say co-ops would be successful.

One could argue that profit is waste.

Its not, its profit. Dividends to share holders are interest payments on vital loans which co-ops don’t have access too. Those early investments provide more of an edge than not having to pay them. Otherwise firms wouldn’t bother with investors at all.

You could say excessive c-suite salaries are a waste. But those high salaries gets you the absolute psychos who will squeeze more excess value from the workers than any co-op could. Co-op workers wont be as greedy with wages or benefits, but they will absolutely look to cut their workload and get more free time (actual freedom).

Part of being a Marxist is accepting that the capitalist theory of profit motive applying to everyone is true. Its not universally true to everyone in every instance. And its certainly not a moral imperative like capitalist ghouls believe. But when we’re talking about statistics and large populations it absolutely does hold.

Making more co-ops doesn’t make them any more competitive against companies that exploit their workers for extra profit.

If you can make a successful co-op then go for it. But they absolutely aren’t a path to any sort of revolution, which communists are all about. Forming a labor union in a critical industry is a much higher priority for communists than starting another co-op.