The cost equation for AirBnB and robo-Uber--when used in the sense of renting out personal property as a side hustle--are different though.
If you're away for the weekend or a business trip, there's very little $$ cost associated with renting out your condo for the weekend (ignoring the risk of a bad renter). It's arguably (almost) free money, again, depending on how you quantify the risk.
The cost of a car, on the other hand, is mostly related to how many miles it's driven, not over how many years it's driven. There are some time-based costs (taxes, insurance mostly, rust in snow states, having older tech) but it's mostly distance.
If you're away for the weekend or a business trip, there's very little $$ cost associated with renting out your condo for the weekend (ignoring the risk of a bad renter). It's arguably (almost) free money, again, depending on how you quantify the risk.
The cost of a car, on the other hand, is mostly related to how many miles it's driven, not over how many years it's driven. There are some time-based costs (taxes, insurance mostly, rust in snow states, having older tech) but it's mostly distance.