If you select "I don't like this recommendation" for a video on youtube, you will get to provide feedback on why you did so: either "I don't like this video" or

If you select "I don't like this recommendation" for a video on youtube, you will get to provide feedback on why you did so: either "I don't like this video" or "I've already watched this video." I've pressed the latter on literally thousands of videos at this point, and after well over a year of this, YouTube still hasn't figured out that I don't want to be recommended videos that I've already watched. Likewise, Google says I should log into their website for personalized search results, but after years of always clicking on Python 3 results over Python 2.7 results, it never learned to show me the correct result. Eventually I realized that personalized recommendations are more or less just a thin cover for collecting vast amounts of data with no benefit to the consumer. I believe we have the technology to do better, but we don't use it. In fact, we seem to be using it less and less.