I have had history turned off for years. It won't recommend anything on the main feed, but when I watch a video, it recommends more as usual. There's plausible

I have had history turned off for years. It won't recommend anything on the main feed, but when I watch a video, it recommends more as usual. There's plausible deniability that the recommendations are based on just what I'm watching but in practice that's obviously not true, many recommendations are based on either my subscriptions or my watch history, as they are not related to the video I am watching but are related to my interests. Since there's not supposed to be any history, I have to trust it's just based on subscriptions. It seems like that could be the case, I guess? But I do have doubts that they do in fact have my history somewhere that's accessible to this recommendation engine.