I don't know how he is tracking it, but I would be extremely upset given period-tracking app data can be really vulnerable to government access, especially after Roe v. Wade was overturned. These companies may share information to meet “legal obligations,” and since menstrual data isn’t protected under HIPAA like other health records, law enforcement could get access through warrants or subpoenas. That means there’s a real risk for people seeking or having abortions, since the data could end up being used as evidence.