Why are ads still so poorly targeted?

I have been a fan of Google products for many years before privacy concerns entered my mind. Especially recently, Google has become astoundingly good at pushing its ecosystem down my throat - all of their services integrate into each other blissfully, and going against the grain is very uncomfortable.

With so much of my personal data being harvested (essentially everything), how come have I not noticed significant improvement in targeted advertising? A lot of ads I see don't even match …

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