Shit, sorry! We didn’t know that these internal stores — which you cannot see — were still retaining your information after the removal request.
Jokes aside, all collected information is likely compiled as an aggregate (which ostensibly removes the personal aspect) that’ll have more uses for than just targeted advertisements, and not just on the data sources themselves. Pattern matching/guesswork for “filling in the blanks” with users they’ve less information on is one possible use case I could think of.
People like you and me can often be predictably unpredictable . . . I think it’s now (more than ever, what with all the quantity of data and extent of technology) the case of what they effectively know, instead of them explicitly having that information.
If it is something that makes you stand out, that would likely count in the category of information that you’d “have” to give out.
If your entire country runs on WhatsApp — for example — there’s not really a practical reason to insist on not using the app just ‘cause of Meta ownership.
Chances are, it doesn’t really matter in the sea of all the others that do the same. Bit of a balance to strike, but not too worrisome if a little bit of personal privacy is the only concern, like your average person.