Sacca's response is interesting because it highlights something very cool about the gig economy: the commoditization of trust.
People are actually far more benevolent than people think. The number of actual murderers and other miscreants is such a small number as to be negligible for the purposes of renting out your home, your car, getting food delivered to you, etc.
You could also argue that this was solved "along the way" and also not really clear back then. I am an AirBnB host myself and were also wondering about this recently and there are several factors today which contribute positively: Provided as a (technical) solution by AirBnB (Recommendations, IDs, etc.) but also how the internet/web evolved as a hole - A place that somehow manages that strangers meaningfully/safely interact with each other. This was never clear and also an uncertainty for Wikipedia (earlier) and now for AirBnB in a different and new way: Inviting strangers to your house.
Part of this is because these companies associate individuals with their real world identities or credit card numbers. Uber does criminal and driving background checks.
People are actually far more benevolent than people think. The number of actual murderers and other miscreants is such a small number as to be negligible for the purposes of renting out your home, your car, getting food delivered to you, etc.