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We have now this in Migros and Coop:
Place it in the stack at the checkout where you unload it and go. Kinda breaks that test. And a headache less for the clerks.
Pretty sure the original post is written in the context of a typical large US supermarket with outdoors parking lot.
There people often buy more groceries then they can carry so they go with the cart to their cars to unload them. After doing that you're supposed to push the cart back to one of cart sheds located in the parking lot, yet many people just leave it where they unloaded it and drive away.
These things have existed in US stores for literal decades now. At least 25+ years that I can say from personal experience, and probably much longer than that.
People are referring to the bigger carts that they use when they need bigger orders like from a grocery store.