In any case, yes, drivers are responsible for securing loads, but in a lawsuit you go after the deepest pockets if you think you might be able to get payment. It would be an interesting argument that Bird is liable as the hunter is at least an independent contractor for Bird while picking up & transporting the scooters for charging.
[1]: Apparently this is the term for those who pull the scooters in and charge them and then redeploy them after the fact for a kickback from Bird.