I feel like the algorithm for recommendations hasn’t changed much in years. It’s decent, better than a lot of other recommendation algorithms. The not interested options have always done jack shit. I can’t count how many times I’ve not interested a video and told it I had already watched it. Only for it to consistently recommend me other videos I’ve already watched. You’d think after the 100th time selecting I wasn’t interested in videos I’ve already watched, that it would get the clue.