In my experience, on a public bus there is reasonable chance of getting a working USB A socket. But as a private business, it's not a complete replacement of the public bus system, however apps are used by people already to book on-the-fly cheap group taxi trips in Shanghai.

For good or ill, most teens do have a smartphone on them, and even kids are often seen with smartwatches that have tracking, and probably WeChat, and every mall I've been to sells them. On the Shanghai bus and metro, people often use a Shanghai public transport card to pay, they do accept old fashioned cash though too. Powerbank rental networks are common on the street and non-returns default to purchases (~$14–$28 USD). Malls, and the Metro often has power available for free.