I'm looking at companies like Bird, Lime and similar. They require an account so that they will have your credit card details on hand and be able to charge you at the end based on the length of your ride. However, I know that places like gas stations charge a large amount and then refund what was unused (during the recent spike in gas prices, the hold increased). I assume that bike rentals could do something like that, charge 100 EUR and then refund however much needed to.
But do companies like that exist?