If Bird leaves a scooter in the road, for someone else to use, they have relinquished the right to control the device, and it is thus abandoned; the alternative is that they are deliberately littering or committing various other property infractions or misdemeanors.
Regarding statutory violations, first of all Bird is probably not littering because the scooters are (arguably) not trash. Second, where the scooters are impounded by cities and other municipalities, it is for parking violations or other statutes against them. As a private citizen, you would have no more right to take their scooter than you would to take my car that was illegally parked.
No, if they are charging use fees, offering money for people to choose charge them, etc., they have not relinquished all rights to control.
> the alternative is that they are deliberately littering or committing various other property infractions or misdemeanors.
That's a big false dichotomy.
https://www.legalmatch.com/law-library/article/abandoned-per...
Property owners don't have any legal responsibility not to leave an item in public unlocked. That might be careless, but it's not illegal.