I think it can be gone quite a lot more simply: Register on each service with a different first and last name and birthdate, linked to a throwaway email address

I think it can be gone quite a lot more simply: Register on each service with a different first and last name and birthdate, linked to a throwaway email address with its own different name and birthdate. Then register on another service with another, and so on. I'm a white American guy, yet because I've watched some Spanish pop videos and used Google Translate for Spanish translations (and done other things, not as part of a concerted mis/disinformation campaign), my Android phone believes I'm a Latin woman, and I even get a mixture of Spanish and English ads and pre-roll commercials on YouTube videos, and some of the ads are for women's clothing and makeup.