The firm — or the collective for that matter- needs equipment, people and inputs. The rub is that before you can sell your services you need to have the equipment in place and that requires money of the kind that is often called capital. Those who put the capital up are seen as owners — they get a share in return.
So yes, the traditional firm does not require to have the traditional owner perspective. But then you need to work out ways to get that equipment in place so you can start having customers. Someone -or some organisation of someones need to take that risk. Crack that and we could see a whole new world of commons cooperatives blossom.
More on this on http://canvas.avbp.net — the canvas that helps commons initiatives form their business plans.