“Cooperative workshop” sounds so much as “hierarchically organized business”, but in the end its not contradictive. Hierarchies exist in every social system, the will overdue in the future in one way or another. I remember a discussion on AirBNB that went more or less the same. Fact is, no, AirBNB and Uber are not good for everyone. AirBNB and Uber are both businesses created based on the idea of creating surplus and the lower edge of society to compete with businesses that are running only slightly higher.
Most taxi drivers are working under minimum wage. The same way AirBNB doesn´t put pressure on luxury hotels, but mostly on hostels, low to mid cost hotels and the housing market (that is: people who do have the financial ressources to buy a house, certainly not those at the top).
Different issue: Those businesses do not run on technology, but on a social net - and they heavily invested to turn it into this network that people now use. AirBNB wasn´t a much needed service, there were other services as well. They had a hard time to get started over years(!), financing their work out of the pockets of their families. They paid professional photographers to take better shots of homes offered on their platform. They nearly went bankrupt shortly before they received Venture Capitalist money and they raised more 1,500,000,000 $ only in one of their private-funding rounds.
Today, large cost of AirBNB are spent for service and support & lawyers. Certainly a self-enforcing platform could cut legal cost necessary to ensure profits, but you cannot easily cut the cost for the support and control of quality when money is involved. Hospitality-club.org, the predecessor of Couchsurfing, ran on volunteers and one reason why that worked out is because no money was involved. As soon as people pay for services things get complicated. I recently used AirBNB and found the place in a miserable state. The kitchen was dirty, the bed was damaged and the whole place smelled like cigarette smoke. The host didn´t agree on our criticism. Following the (self-enforced) conditions we would have received 1/3 of our deposited money for staying there only several hours. Fortunately AirBNB had their employees looking at our case, communicating with the host and me several time via phone, organizing us an alternative place to stay and in the end we received all our funds back. That´s one of the reasons why people use the service (even though there are cases that do not work out perfect as it did with us). A program couldn´t have judged easily who´s right and who´s wrong in this situation. Most likely it would have left me with losing my money and giving me the opportunity to give the host a shitty rating. Yes, in this case most people prefer to pay a bit more and lower the risk of getting ripped.
That´s not saying it´s not possible to create a decentralized sharing platform, that´s absolutely possible. But it won´t come from “imagine”, it will come when people are willing to make massive risk investments for this kind of services. Sometimes comments here sound as if this services will come by itself. I hardly see anyone who is willing to write a substantial concept for that. I hardly see anyone saying: I´m willing to invest 1000$ for this idea. If SAFE is delivered in ~3month then now is the perfect time to start working.
btw. I´d be interested in creating a carsharing (not Uber style) app and can assist with concept and graphic design.