I'm not sure if I understand this. If you show up on a website one day with one fingerprint, but on the next day it was a different fingerprint, there's no way to connect that it's the same device unless it wasn't a core trait of the fingerprint in the first place.

I don't know a lot about iCloud in particular, but in general there are not enough active VPN users to make a noticeable difference in tracking. By its nature ad tracking does not have to be super accurate in the aggregate to beat a wild guess.

As someone who works in this tech space, nobody brings up how long fingerprints persist. And the reality is that even a really precise fingerprint has a half-life of only a few days (especially if it's based on characteristics like window size or software versions).

A lot of the big ad networks right now instead rely heavily on geo-data. Which is why you are probably seeing lots of ads in your feeds that seemingly cross between devices or are relating to interests of your spouse/friends/etc. They just look at the geo on your IP and literally flood the zone.

> They developed a measurement framework called FPTrace, which assesses fingerprinting-based user tracking by analyzing how ad systems respond to changes in browser fingerprints.

I'm curious to know a bit more about their methodology. It's more likely to me that the ad networks are probably segmenting the ads based on device settings more than they are individually targeting based on fingerprints. For example, someone running new software versions on new hardware might be lumped into a hotter buyer category. Also, simple things like time of day have huge impacts on ad bidding, so knowing how they controlled would be everything.

Whether or not you like Google or their practices, I don't necessarily understand people who insist on getting something for free and also get upset about the service. There are many bad/unreasonable things YouTube does but this is the least objectionable, imho.

As the saying go, "if the product is free, you are the product". Pay for your stuff, or you degrade yourself.

I'll just say that Youtube Premium has been a good value and there's comfort knowing that creators get a ton more revenue from my views.

Make sure you do a valve adjustment on the Fit engine every 100k or so. Easy job to do with some basic tools and a few hours on a Saturday afternoon.