It's called 'Rolling Shutter'. This was never a problem until the advent of using CMOS sensors for motion recording. It basically started with the Canon 5D and iPhone video.
As a camera operator, this crap technology gave me my first gray hairs. It allows for the processor and write tech in the camera to only handle one line of pixels at a time instead of the entire frame. In response, camera departments had to invent the term 'Global Shutter' to describe the proper way to do it, in which the entire frame is captured at once.