to be fair, that could in part be the Baader-Meinhoff effect [1], where you'll only remember the ones that were scarily accurate (though I do agree with you).
I don't know what the hit rate was, because as you suggest I likely ignored the irrelevant ads. However, the ads that were relevant were so eerily accurate (including things many of my friends and acquaintances wouldn't know about me) that I didn't want anything more to do with the platform.
--- [1]: https://en.wikipedia.org/wiki/Frequency_illusion