There's a proven way to prevent bike theft. So why are so few cities doing it?

And it's a combination of 1. Bike registry 2. Building more bike lock up sites out in the open 3. Giving loaner bike locks to restaurant/Store owners, to lend their customers. 4. Having event organizers provide a security guard at the bike parking of events.

He thinks that if combining all these little things together, we can put a big dent in bike theft.

Personally I think the real solution will be the one two punch of adding an air tag like device to every bike to keep track of it combined with the inevitable rise of security/ring cameras everywhere.