I have found out that google uses atleast 1 of the last 2 "doubt" ones. My sister was watching my little pony on her laptop without being logged in and her recc

I have found out that google uses atleast 1 of the last 2 "doubt" ones. My sister was watching my little pony on her laptop without being logged in and her reccomendations would "leak" into my reccomendations on different computer with logged in account. It was very annoying and even flagging the videos as "not interested" or "don't show" wouldn't help much. I think I "fixed" it by disabling yt history or something. I am not sure. This was 2...3 years ago