Gmail can read your emails and attachments to train its AI, unless you opt out
(www.malwarebytes.com)
Fun fact: A zip code, gender, and a DOB is enough to have an 85% chance of it being you. It's a very well-studied area. You are de-anonymized with very little data exposed, all of which Google includes in ad auctions.
https://dataprivacylab.org/projects/identifiability/paper1.pdf
https://georgetownlawtechreview.org/re-identification-of-anonymized-data/GLTR-04-2017/
https://www.johndcook.com/blog/2018/12/07/simulating-zipcode-sex-birthdate/