This is unequivocally an “only in Japan” situation, and part of why I love visiting that beautiful and interesting country…
See how this bike, which was outside a major train station (Shinagawa Station), is “locked” only by a small brown cloth tied around the chassis and the rail (below the seat) ….
Had this been in Paris, London, or New York, this bike would have been stripped and sold for parts in 30 seconds flat …