For the first few hours, I see new default youtube suggestions. After a few days, I see a lot of old search/view videos pop back to the youtube home page. YT still seems "suggested" videos for me to watch base on the past viewing info.
E.g. a sexual photo retrieved from a private social media album is no threat to your reputation when it’s been assumed into some machine learning model for detecting sexual photos, but it’s certainly a threat if a future data leak allows your enemies to get the actual .PNG or .JPG and send it to the news media or your loved ones. Knowing that the photo can actually be deleted is valuable in this case and I’m sure there are many other similar ones that could be listed.
Users want to delete watch history, which they can. Classifier models predicting what you want to watch are not the video watch history, nor are the models capable of producing it.
But that probably is not the only model generated from your data, is it? They probably have many other models generated from your data, everything from ad-displaying models to profiling models for Hydra.