That example only demonstrates leaked information of the drivers, not the passengers/customers. And the "anonymized" driver and license data wouldn't need to be released in any form at all to produce a dataset useful for public transportation planning purposes: approximate time of day and approximate location are sufficient to estimate demand, and there's no need to keep track of who is making which trips.

Exactly, all you need to start is "a significant amount of people from this area want to go to those areas".