[pksebben]

This is a fair point. Including them is a little weird in the first place and totally a red flag.

[zero-sharp]

I can find plenty of Indeed postings that won't let you submit the application without specifying ...

[speedgoose]

Could it be a USA thing?

[t-writescode]

I'm not in HR; but I imagine they're very averse to anything that might reflect bias in employment and putting your gender, current ability to get pregnant, religion, etc, on a resume would absolutely count in that way, I imagine.

[hackable_sand]

Definitely not US. We have voluntary self identification.

[zero-sharp]

Yea that's how it's supposed to be, right? However, I am sure that I've seen applications which don't categorize that input as optional.