Many large, higher quality ad buyers (agencies and direct sold) can get enough return from non-greyarea inventory like this. There's no point in them taking (even a small) perceived risk of buying this grey market inventory.
However, they likely do use this tracking data second or third hand via their third party data providers brokering and including it in larger data sets they use for cross site targeting via DMPs.
Finally, there's simple economics: people who go through enough effort to block trackers and other things are (perceived) to be less likely to engage with ads (e.g. they see it as you do, when one 'slips through'). So there's no point in paying $$$ for those eyeballs.
All of this in combination means you get low quality, barrel bottoms ads.