I live in a city with ubiquitous (non-E) shared bicycles (Shenzhen), and unfortunately maintenance does become your problem... You have to go from bike to bike performing basic maintenance tests (is the brake working? Is the chain non-rattly? Seat adjustable? Anything broken?) and still sometimes end up with a non-working bike that doesn't work quite right. For the bike sharing company it's an even bigger problem (the two/three remaining companies employ an army of staff to keep moving the bikes to where they are needed and attempt some basic maintenance, literally a team on every street corner).