I'm guessing that's because people riding them would've otherwise walked, and/or the vehicles that have to drive around moving and charging them make up for any reductions?

+ the manufacturing emissions for a large-ish battery and a high wastage rate for the whole units www.wired.com/story/e-scoo...

Escooter Rentals Aren’t as Green as You Think

Dubious design and inefficient operations are just some of the reasons why shared scooters’ eco-credentials are thin.