The lock-in originates from (1) immediate (< 5 min) availability of a ride and (2) high density of customers, so drivers aren't idle. Ultimately, it comes down

The lock-in originates from (1) immediate (< 5 min) availability of a ride and (2) high density of customers, so drivers aren't idle. Ultimately, it comes down to the numbers, which no one outside of the ridesharing companies really has.