Typing requires the accelerometer for some functions (like undo on Apple at least).

but that would be your keyboards permission not the app

Maybe it doesn’t pass through? Some apps need permission for camera and library, the camera would in theory give access to library like the keyboard to accelerometer?

No, the camera and library always has been separate, it's just that Apple's official camera app integrates them. Think about it, one's hardware and the other one's basically software.