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"Privacy preserving Advertising" is bullshit. Just do context based ads.

Oh you're in a car subreddit? Maybe show car ads... instead of hyper personalized diet ads for my fat ass...

Advertising is not hard to do without collecting tons of data, it's just a little bit more expensive if you can't target that well. I don't care. Only they care about that.

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PPA is about attribution. It doesn't determine ad types you're seeing like Google's Topics. What it's for is having an allegedly private way to determine if you actually bought a product based on an ad you've seen. Marketeers love having that data so they can determine if their ads are effective to trigger purchases (called "conversions")

I'm not in favour of PPA by the way. I turned it off everywhere. But I just wanted to highlight this.

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