Scooters on sidewalks are dangerous and should be banned.
We have explicit laws against skateboarding and riding bicycles on sidewalks in most communities. For bicyclists in San Francisco: "It’s illegal to ride on the sidewalk if you are over the age of 13. (SF Transportation Code Sec. 7.2.12)" https://sfbike.org/resources/bicycle-law/rules-of-the-road/
Yet, everyday you can find scooters on sidewalks wherever scooters are available. Toddlers use sidewalks - they walk in a random walk. Hearing impaired, sight-impaired, mobility-impaired people use sidewalks. Seniors use sidewalks. These people do not expect 180lb adults riding at 5 to 10mph right in their face. The kinetic energy and momentum at 10mph of an adult is considerable.
Falls for anybody can lead to bone fractures. Even more so for seniors. Hip fractures in particular can be fatal for seniors. https://medicalxpress.com/news/2018-06-hip-fractures-elderly...
Scooters should not be allowed on sidewalks.