Additionally, using implicit hormone levels to adjust the ads that people with menstruations see is uniquely predatory and manipulative. It also serves to "out" trans men when this data can be tied to a profile of someone who as chosen a non-female gender on other online platforms.

Advertising by itself is directly harmful. Its secondary effects on the world are catastrophic. Adding a new layer of "this person is PMSing, let's give them makeup ads because they're feeling insecure" is just evil.