The most stolen items in New York City are a cell phone, and a bicycle. Most bicycles are stolen while they are in public, either not locked up, or locked up with an insufficiently strong lock. The most effective way to stop your bike from being stolen while unattended in public in NYC, is to attach it to the right type of immovable object, with a heavy duty lock. Most universities in NYC recommended a particular brand of heavy duty lock and chain (Kryptonite New York "FAHGETTABOUDIT" chain), because of its balance of usability, affordability, and preventative effect. Because students and professors tend to have bikes.
Despite a $12 billion dollar annual budget, NYPD leadership *doesn't even recognize* one of the most recommended models of bike lock. Billion. Not a typo.
https://hachyderm.io/@mekkaokereke/112451441016741832
NYPD is not designed to recover stolen bikes, or to prevent them from being stolen in the first place.