almost the same case in poland lol, even in poorer areas, I never even had to think about leaving a euro coin because all the carts already have them inserted (even though most people return their carts, they seem to just keep their coins in there...)

Whealthiness vs lazyness lol.

In Spain people leave carts around too, but they either manage to retrieve the coin without other cart or they use a keyless method.

TL;DR: I have a trick to grab carts without leaving a coin or any placeholder in the cart, but people are such pieces of shit that I still always return the cart AND chain it up, because the next person who grabs it with no coin may just leave it anywhere.

Backstory:

Over 15 years ago, while I was working for a hypermarket chain for the summer, I found out a coworker was using those old can opener twist "keys" to get carts and then pull the key out right away sideways. My parents actually still had a couple of those at home that I grabbed for myself, and my dad later used them as a template to make more of these "coinless-keys".