Only if they’re a bit old. Nowadays WiFi chips double as Bluetooth chips on newer platforms.

That's a technocratic reply, not one that is useful in the real world.

As noted by the person you're replying to, it's not his computer. It's a public library.

Most computers in non-residential settings will have various features locked down, including Bluetooth.

Hotels, clubs, airport lounges, various government facilities… there are thousands of places where you might really need to use a computer but don't control the technology.