How about the Youtube app (for example) shows me ads for vacuum cleaners when I'm looking at videos of vacuum cleaner reviews instead of trying to tie together

How about the Youtube app (for example) shows me ads for vacuum cleaners when I'm looking at videos of vacuum cleaner reviews instead of trying to tie together every single activity on my phone I've ever done to try and predict when to show me vacuum cleaner ads while I'm watching a video on car repairs. Im sure some smart person could even figure out how to show maid service ads before the vacuum cleaner review video too. Facebook doesn't need to know everything I do or look at to serve ads.