The API changes were the trigger for the recent controversy and the fact that they may be forced to use the buggy official app instead of an unofficial but stable and well developed app pushed people too far. The API change is what caused the blackout and disgust for Reddit.
Wait, the default thumbnails are no longer just chosen from three points in the video based on percentage? Now they use algorithms to generate a suitable thumbnail too?
Why doesn't it work well unless I do it like how you're doing it?