People in power want the information to identify a narrower set of people who may have been pregnant and then did not have a child and so may have had an abortion.

And facebook doesn't care about people's rights when those people in power are able to block Facebook from acquiring some new startup they want to buy, so facebook is willing to share the information.

If you stop having a period for a few months and then start again, it may be worth buying some location data during that time to see if you were near any medical offices that may have offered illegal abortion services.

Not sure why, but they did cooperate with the government on such matters

Facebook previously gave private Messenger chats to Nebraska police, these messages were used as key evidence to charge a mother and daughter over an alleged illegal abortion[1]

[1] https://www.theguardian.com/us-news/2022/aug/10/facebook-use...

Meta is a defense contractor. They absolutely would do this for money if asked. Just like how a good portion of HN would.

The data is already being (ab)used in the UK. https://humanists.uk/2025/06/04/police-access-to-period-apps...

To punish people they suspect in abortion, for example.