This is maybe not exactly what you’re looking for, but fluctuonot affiliated is a shared1 mobility aggregator that provides a map where it lists all available shared1 vehicles (bikes, scooters, mopeds) on a location.
Additionally, there is a Github repository that lists bike sharing systems that publish their information in accordance with the General Bikeshare Feed Specification (GBFS), which is a standardized data feed for shared mobility system availability.
1: It’s actually all rental mobility, as one always has to pay for the service of using a vehicle. It’s just that the vehicle is not rented out at a single location but on different locations in an area.
Clever marketing has spread the term "shared mobility" to give it a friendly and less profit oriented vibe.
Wikipedia is your friend with an entry on Bicycle sharing systems.
Credit:stackoverflow.com‘