It's chaos vs. order. A bike rack is a place that a bike get put if the owner doesn't want it to be stolen or cleaned up. Bird scooters get left all over the fucking place. The closest analog is areas around big box stores where people often abandon shopping carts. Sure they're theoretically useful and private property. They're also basically random garbage for anyone who doesn't need a shopping cart at that moment. And, like Bird scooters, cities usually respond by either forcing the owner (store) to clean the things up[1] or by cleaning them up themselves[2].

[1] https://www.sandiegouniontribune.com/sdut-el-cajon-aims-clea...

[2] https://www.mississauga.ca/portal/services/reportabandonedsh...