The whole product is the legal rights to the produced outputs and the liabilities for the used-up inputs not value. The employer legally owns the outputs and is legally liable for the used-up inputs.
FOSS can use quadratic funding. Not arguing for complete market abolition.
The workers are de facto responsible for production. By the principle that legal and de facto responsibility should match, the workers should jointly receive the whole product of the firm. The workers can delegate in a coop