Not sure if there is a difference based on local culture or amount of drunk tourists, but just some small reminders in the apps and sometimes requiring that you take a photo of how you parked at the end of a trip was enough to get all of this under control in my home city.

If a renter just leaves a car or scooter sitting in the middle of a road or walkway, the company should pass the fine for that to them. And if no fines for that exist yet, why not start with introducing them instead of a blanket ban?

In Prague, specifically?

If someone did the exact same business model just with cars instead of e-scooters they would probably be celebrated instead of banned.