Because the purpose of many people delivering food is not to make money to support their families, but for other purposes, such as exercising.

There is such a colleague around me. A company executive earns tens of thousands of dollars a month. He signed up for Meituan crowdsourcing and delivered 2 takeaways after get off work every day before going home.

This may seem unbelievable to many people, but it does exist in reality. The investment banking tycoon in the Snowball Forum has an annual salary of several million. He delivers food after get off work every day. He shares all the people and events he meets in the forum and experiences life.