Lately, I've been finding more and more videos (mostly those with marketing purposes) that are don't have the so called "playbar", ie. the timeline control that allows you to jump inside the video to any point you want. They leave only the Play/Pause button and volume control.
Personally, I find this annoying but they ultimately reach their goal, which is me watching the full video.
Is this a dark pattern? Are there any studies or statistics about the average engagement with and without the playbar enabled? How can the impact of this decision be quantified in terms of UX?