There is no need for all businesses to be cooperatives. Just require that majority voting shares be held by workers in a business always. Other people can buy shares to sell if they go higher or for dividend payouts. This would secure worker ownership of a business while still allowing for markets.
While banks should be part of the funding structure, disallowing VCs would have to mean disallowing any person from investing in anything, since that's what VCs are, just a bunch of people getting together and putting money into things.
Socialism is actually full daddy-state.
Communism would be a stateless existence.