I find the autoplay so annoying because it hides the thumbnail which was carefully designed to communicate why I should click on the video and replaces it with, usually, a talking head or stock footage. Often the video gets inexplicably added to my watch history, and if I do choose to click on it I have to go back to the beginning because I missed the start of the audio
Additionally there's a bug on the Android app that it sometimes doesn't show video titles (or the worlds worst A/B test?), so scrolling through I just see talking heads (since it autoplays instead of showing the video thumb) and have to force restart it to actually understand what's going on.
Most useless message ever, placed exactly where you do not want it to be.