A young friend of mine in England keeps getting his bike stolen. He’s tried alarms which just annoy the neighbors and drive him crazy to go out and reset. Snip and the bike is gone leaving the still whining chain.
I am more practical and maybe a little more aggressive than he is. My thought is the only way to get the chain and/or lock off the bike is to snip with metal cutters.
So why not invent a chain and lock that when touched by anything metal will instantly electrocute the thief. Throw them ten feet away from your bike and see them run! 😀
This would be completely safe even to animals or passerbyes who come too close to the bike while walking near it. Simple solution to an expensive problem.