There's a lock out there (I had to buy one because of so many stolen bikes), but it blairs like a car alarm if disturbed and pages a keychain pager up to 1 mile away. Ive always used a regular sturdy U lock and still do, but this one helps alert the owner of tampering.
It's gone off twice INSIDE my parkade after 3 previous attempts without the alarm lock, to steal the bike. The thiefs instead decided to cut the wires on my bike because they couldn't steal it.
Now, I sleep with the pager near by and a baseball bat beside the bed. I would run outside buck ass naked chasing those dirty vagrents down to destroy their ability to use their legs if given even the slightest chance.
But that's enough hate. I love my bikes and I feel the pain of anyone who has experienced similar loss.
Alternatively, there is a company that sells remote controlled "squirrel zappers" and weaponized sound wave devices, which connected to a bait bike in an appropriate manner may provide hours and hours of fun. I got the idea from youtube and then sourced parts online and there is a company in the United states that makes some very cool electronics that are very dangerous / useful.
I don't think I'm allowed to post the site name though, but if you want to know where to find these items to help deter and punish would be theives, I'd be MORE than glad. Street justice is the only way, police won't and pretty much can't do jack shit about a stolen bike unless it's registered and shows up at a pawn shop. Which, in all honesty would be a very short sighted move on the part of a savvy theif. The only way is to intercept, bear mace them and beat them into fear of vigilance from a growing number of angry victims of bike theft. Its's been a nearly $3000 loss for me so far. Gets a guy in the feels... sorry about the rant lol