How do they avoid theft? My town tried bike sharing and within weeks all the bikes were gone or destroyed.

Specialized biked and specialized docks - when you park a bike in a dock, a heavy bolt locks it into place. This is done within an enclosure that covers much of he front wheel, and the only way to get at the lock would be to dismantle the entire apparatus. The bikes themselves have no detachable parts and are _extremely_ distinctive with a street value of "You have the right to remain silent".