... until clicking the play button.
So everyone ITT saying that “nobody wants automatically playing videos”. Actually yeah, we do, and there are many, and I mean MANY of us.
But I do have a lot of friends that spend time browsing facebook, and not a single one likes autoplaying videos, either wanted or unwanted ones.
Videos do not get into your screen at the same exact time you focus your attention on them. On the occasion that you'll want to watch the video, autoplaying just forces you to see a lot of out of context spoilers and video endings.
There are probably uses that I'm not thinking of (or don't partake in) where this would still be a problem for people.