Since switching off personalised ads, I have noticed just how bad the ad targetting has become on my sites.
To use the widget example: the ads that I see on my 'Blue Widget' site are mostly for 'Blue Sprockets', but my audience has no interest in sprockets at all. I know that there are plenty of ads out there for 'Blue Widgets', but they just don't get displayed on my site.
Apart from 'sprocket' ads, I also see ads for 'Pink Widgets', but again these are of no interest to my readers, since pink widgets are not popular in this geographical region (EU).
I can speculate that this is related to the use of AI, but that worries me, since that may mean that I need to display a massive number of incorrect ads before the 'AI' starts to get the targetting right.
I cannot emphasise just how bad this targetting is: I have literally seen no relevant ads at all in the last few days - except for the occasional personalised ad (which I should not be seeing at all).