Not a stupid question! The bikes in the Baltimore bike share (and I think also the NYC bike share) had electric motors that would work with the rider to make peddling easier. Thus they had to be left in charging “yokes” when you were done with them.
As for why a non-powered bike couldn’t just be left around, here are a few thoughts:
- As some people have mentioned, bikes are just bigger, and take up way more sidewalk space. If Bird and Lime have gotten unpopular, a “Bird for Bikes” would probably make people livid.
- Honestly, the fact that Birds and Limes come with Anti-theft mechanisms and GPS transponders (which run on the same battery as the motor I think) makes them a bit harder to steal (and there aren’t easily removable parts or a viable black market for selling them). Even a non-powered bike would need a charge every once in a while if it relied on power for its transponder.
- I think the “we supply’em, you pay us to ride’em, we pay people to charge’em” business model is just a straight up new thing that happened to be first successfully done by a scooter startup. I imagine it would be hard for a person in a minivan to pick up tons of bikes for charging without having to remove their minivan’s seats. Again, scooters being small is a big advantage, which is probably also why bigger “sit down” vespa-style scooter startups don’t seem to be a factor right now.