In my experience they mostly don't get maintenance; they're just built extremely cheaply and treated as disposable. Various parts that are easy to break (derailleurs) are elided by using Internally-Geared Hubs (IGH). The wheels are non-pneumatic and just a solid piece of rubber, so they never go flat.

> Internally-Geared Hubs (IGH)

Just so good. I wish they had more gears. My older one has 8, and I see more on newer ones but not a lot.

Dockless bikeshare bikes are often built as you describe.

Docked bikeshare (as mostly operated by Lyft in the US, formerly Motivate/Alta) generally uses bikes built similarly to high-quality Dutch city bikes and maintains them.

Docked bikeshare is pretty useless in my experience, so despite the lower quality bikes I prefer the dockless model.

I guess this depends on the bike share program. I've definitely ridden my share of bike share bikes that were in very bad shape (and I have a fairly high tolerance for junkers).

The bike share program in question shut down and isn't available in my area anymore, so maybe that was just because they were cutting back.

The docked bikes in my city have way better build quality and maintenance standards than the undocked ones. They're both heavy but the undocked ones have chains falling off, broken shifters, etc. I expect it makes sense that these get less investment as they are easier to steal.