In San Francisco, there was a big spike in bike mode share that corresponded with a period that the city was under a court order to not build bike infra because of an impending lawsuit. When the injunction was lifted, a ton of infra got installed but mode share flattened and is now declining. Why?

So, one point is that bike mode share is very context-specific, and what works in one city isn't necessarily portable. One thing that Amsterdam, Copenhagen, and NYC have in common is substantial waterways, and cities without them have much more difficulty making bikeways that are pleasant.