I use bike shares opportunistically, but they are not a reliable mode of transport.
As a pure anecdote, my husband had his bike outside in Prospect Heights for 3 or 4 years literally not moved. It had a lock but he didn’t even use the bike. It got weathered and abused and after literal years, I think it was finally stolen. In Seattle, where his has been broken into multiple times in a locked garage in our luxury building, I have no doubt that an untouched bike would have lasted a few weeks at most.
But that’s all anecdotal. I can say that in the 5 years or so that I used the CitiBike system, I never had a problem either finding a bike and the pricing was also more than fair. I frequently would take a bike from near Union Square and ride across the Brooklyn Bridge home on nice afternoons. I never once had a problem getting a bike or returning it to its drop off place near my apartment.
And the app/locator lets you know the status of bikes at any time so you can know if there is a bike at a specific site or not.
This might have changed in the last few years, but if anything, the city had a hard time convincing people to use the bikes. The system is a lot more efficient than the Lime bike/scooter setup that a lot of other cities like Seattle have (people in Seattle also don’t know how to use bike lanes and use the fucking sidewalks like assholes, because Seattle).
It really feels more careless to just ditch your bicycle on the side of the road and forget about it than lock it. I admit it's not a big thing, but as I tried to convey, small things like this add up.