You should know that in many cities in the US, where there’s any kind of network of paths and trails for cyclists or walkers, they are typically off limits to scooters or anything other than a Class 1 E-bike. When you mention “scooters” all sorts of alarm bells go off with me. I do not want to share these paths with motorized vehicles.
As well, you might not be aware that a lot of the cycling activity websites do a form of crowd sourcing currently, so you are somewhat re-inventing the wheel. RideWithGPS, MapMyRide, Strava (the Biggy) as well as the giant in GPS cycling devices - Garmin, all do a form of what you are describing.
I think linking routes with other available resources such as Google Bicycle mapping as well as incorporating things like the NYC Bike Map (and others) into a digital form would have use to people.