There is no way to stop people from stealing. Humans have been stealing since well before computers came around, and they’ll never stop (at least not in our lifetimes). It’s better to let go of the idea of stopping it and figure out ways to work around it.
Theft is an unstoppable force. If you see a car speeding towards you and you want to live, you don’t think of how to stop the car, you just get the hell out of the way.