I would prefer to see ads for things that I want rather then see ads for stuff I couldn't care less about.
If I get convinced to buy useful things it's a win/win.
That could an opt in option, but the rest of us don’t want it. Google (or whatever ad company replaces it (Addled?) could give you the chance to opt in to ads and leave the rest of us alone. I’m fine with seeing ads about hunting when I’m on a gun sales website or local restaurants if I’m looking at recipes on Epicurious, just stop following me around, creeper (google)
If you and enough others find such fine-tuned recommendations helpful then they would continue to exist without intrusive advertising. There are entire magazines full of ads that people pay for.