Every electronic device with networking capability that exists has a “burned-in” MAC address that tells you info on the manufacturer, etc.

You’re thinking of WiFi/Ethernet/Bluetooth. There’s plenty of radio control options for drones that don’t use MAC addresses. Some are completely analog (though there’s not many of those left), but even the digital ones don’t necessarily have MAC addresses.

MAC addresses aren’t some government-mandated thing. They’re something the industry came up with.