The market takes its little cut of every transaction, but takes zero percent of the risk. That's all passed on to the individual participants.
Car break down? Not Uber's fault. Get hit by a drunk driver? Lyft don't care. Have an allergic reaction to your latex gloves? Doesn't have anything to do with TaskRabbit as far as they're concerned.
Taking this down to a more concrete level, if every transaction and popular properties in a market were recorded and undoxx-ably published blockchain-style, then market actors who try to externalize costs will find those properties they are externalizing upon others added to the system, and their activity shunned more quickly. Much rent-seeking and externalizing behavior today in businesses (especially gig economy-pitch-based businesses) relies upon a great deal of extreme asymmetric information postures between the parties, possible because of the much more complex information ecosystem we operate in as economic actors today.