Now to be clear, the disclosure Chrome provides to users is not *adequate*. Their wording of the "Ad Privacy" feature popup is highly disingenuous and the process to disable once notification is given is too complex and must be performed on a per-profile basis. But at least they *do it*, and to my knowledge don't track/send the data until the popup is displayed. Whereas Firefox just snuck this in in a software update, checked by default and you're probably learning about it now, on social media.
Other, loose angles to consider this from:
- Google/Firefox claim their tracking features are not "tracking" because they use something called "differential privacy". I don't have room to explain this class of technology, but I sincerely consider it to be fake. Without getting into the details, they provide *less* information to the advertisers than a cookie would have. But I'd prefer they provide none. Steps are taken to anonymize the data, but what is anonymized can often be de-anonymized.