Following the COVID impact on tourism in Cambodia, infamous casinos in Sihanoukville, Cambodia, transformed into scam centers full of slaves coming from abroad.
More details: if you ordered a "Golden Menu" with a "McFirst" sandwich on the mobile app or on the self-service machine, almost everything you add would have been for free. The bug was first reported on Twitter and it took about 7 hours for restaurants to refuse to give orders.
Interesting that they had the exact same issue on both platforms. It's also the kind of thing where some people might just guess that the behavior is intentional and take advantage of it.