Technically if there's no company yet there is nowhere to work and thus no workers. You need "founders" to get the company started for there even to be workers. Now those people have to decide if they want to never hire anybody new, 'give away' a a piece of 'their' company each time they hire, or give up on the worker-owned idea all together.
Of course most "founders" used to be "workers" and often become "workers" again after the company is founded, but the act of founding a company is fundamentally different from the act of working at a company