Asking for the same reason I asked OP my question. I was just in Berlin and, second only to Tokyo, I've never* seen such conscientious group of people, including teens.
* I'd actually place two other cities from that trip into the same #2 position: Zurich and Vienna.
Some links:
(2025) 300+ e-scooters recovered from the Spree (river in Berlin) by Spree:publik activist Jan Ebel: https://www.morgenpost.de/bezirke/treptow-koepenick/article4...
(2024) Readers of "Neue Rottweiler Zeitung" mention e-scooters in the Neckar: https://www.nrwz.de/rottweil/e-scooter-laufen-gut-in-rottwei...
(2021) 500+ e-scooters were thrown from the Hohenzollern bridge into the Rhine: https://www.golem.de/news/mikromobilitaet-im-rhein-liegen-hu...
(2021) Dozens of e-scooters in the Main: https://www.fnp.de/frankfurt/chaoten-werfen-scooter-einfach-...
Here its mostly teens who throw rental escooters into rivers.