You are right. I think they should make it more clear.
In the FakeSpot privacy notice, Google Analytics, Social Media Platforms, Contact Info, and Identifiers are not collected by Firefox, among others. So it's fair to say the data collected is not linked to the user.
The browser.shopping.experience2023.ads.enabled flag is intriguing. So I took a look. It turns out that the recommendation is only based on the current page you request the review analysis.
In general, I believe that it is primarily ambiguous legal documents rather than a genuine invasion of privacy.
For those who haven't read the article, the suggested solution is for advertisers to obtain similar user IDs by using their own user list; it has nothing to do with gathering user data from the browser.
It is utilized in conjunction with other differential privacy technologies that gather user information and classify users.
In fairness, Mozilla needs a means of making money if anyone hopes Firefox or Librewolf to exist in the long run.