This is one of the more unconvincing statements in this article. The massive convenience win that shared bicycles, scooters, cars etc bring to cities is well worth the "inconvenience" of them being parked on the sidewalk.
I think SF needs to go the route of Shanghai, Beijing, Shenzhen etc and designate MANY, MANY bicycle parking zones on the city's sidewalks.
As long as the companies are decentized to allow their machines to be a public nuisance (fines), they will pass on the cost of poor parking behavior to whomever actually place the scooter in a dangerous / rude / thoughtless place. See the "Mobike Score" [0].
I hate the rhetoric that the streets are being vitiated by shared transportation. There are simple fixes to these problems.
[0] https://mobike.com/us/faq (Mobike Score)