I seem to have missed reading about this Privacy Preserving Attribution API before this release. I’m still reading up on this now and might be misunderstanding, but how enticing is this really to advertisers if the user data is supposedly anonymized? Also, is there some type of monetary exchange between organizations? If not, then I’m failing to see why Firefox would need to send this data in the first place.
Together with our co-authors from Meta, we’ve recently proposed IPA to the Private Advertising Technology >Community Group, or PATCG. PATCG is a group in the W3C specifically formed to work on improving advertising >without compromising on privacy.
It's spyware.
Whoever is running the aggregation service can see where you have been.