[jaibot]

We also give food and shelter to guests for free, but restaurants and hotels are still a thing. People do favors for people, and employment is still a thing. People look after each others' kids, but daycare is still a thing.

You probably know fewer than 200 people. Sometimes you can't ask any of them for a favor. Sometimes you don't want to impose on your friends. Sometimes someone would happily do something for you in exchange for some amount of money, and you'll both be better off.

The sharing economy expands the pool of people you can ask to do things for you; is also expands the pool of people who are willing to give you money for doing things. It does not replace friendship and socialability.