Both Airbnb and Uber have incentives to make it right without a mechanism to reverse financial transactions and will increase the value of reputation/feedback/reviews . The system we have now incentivizes fraud and merchants are getting screwed badly
Discussion
There’s still a lot of situations where not having a mediator might make commerce, think overseas vendors etc.
Don’t get me wrong I hate rent seekers like visa/mastercard and they need to go, but their networks actually minimize trust required with unknown vendors.