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If every site and advertiser know who you are and knows what you are looking to buy, they might price a product or service for you, meaning higher prices. Just one of the issues with tracking.

No user in their right consciousness would click allow tracking. And Facebook knows that. So Facebook by showing a pre-empt message is essentially trying to picture personalized ads as good. Plus, by saying “support small businesses” they’re simply playing the victim card and diverting the attention away from data privacy. Facebook’s sole aim is to get users to click the allow button. If this isn’t gaslighting then I’m not sure what is.

https://www.wired.com/story/track-location-with-mobile-ads-1...

Basic summary trawl someone’s social media. Get a small handful of their least common interests. Run an ad that only hits a dozen or so people in even a metropolitan area.

This is something that is cheap enough that private investigators and legal firms looking for dirt on a target will do so.