I have seen this backfire on pax who had to gate check bags. They come down to baggage claims and ask for their bags. Because their bag tags show the airport as a connecting city, the bags are stored in a separate facility, to be loaded on the next flight, and they don’t come out on the baggage carousel. We just tell them they need to pick up their bags at their tagged final destination, and then send a report to our security dept about suspected hidden city ticketing. Airlines certainly monitor this activity.