Instagram recently received a minor update with bug fixes, and you may not have noticed that a small setting is no longer present in the iPhone app. You used to be able to disable autoplay for videos, but now the only video options are for sound and preloading over Wi-Fi-only.
The change may not seem that significant at first, but when you consider that Instagram is about to introduce video ads, it makes more sense.
Instagram told Engadget that “it disabled the option due to “confusion” from users regarding what clips will play with sound,” but it just so happens that the decision is also a nice bonus for potential advertisers. Who wants to sell video ads to people when they could just disable them with a quick toggle?