I guess we all knew this was happening, but it's hard to "prove" that they track you across devices without resorting to anecdotes. This seems to be a framework for performing studies + a large-scale study in order to get some more concrete proof that it is actually happening in practice, and the fingerprinting isn't just used for other things like anti-abuse.
> Prior studies only measured whether fingerprinting-related scripts are being run on the websites but that in itself does not necessarily mean that fingerprinting is being used for the privacy-invasive purpose of online tracking because fingerprinting might be deployed for the defensive purposes of bot/fraud detection and user authentication. [...] a framework to assess fingerprinting-based user tracking by analyzing ad changes from browser fingerprinting adjustments - https://dl.acm.org/doi/10.1145/3696410.3714548
Unfortunately I don't have access to the paper myself, so not sure what details they share beyond that.
> Prior studies only measured whether fingerprinting-related scripts are being run on the websites but that in itself does not necessarily mean that fingerprinting is being used for the privacy-invasive purpose of online tracking because fingerprinting might be deployed for the defensive purposes of bot/fraud detection and user authentication. [...] a framework to assess fingerprinting-based user tracking by analyzing ad changes from browser fingerprinting adjustments - https://dl.acm.org/doi/10.1145/3696410.3714548
Unfortunately I don't have access to the paper myself, so not sure what details they share beyond that.