This is such a disgusting, predatory invasion of privacy and it's as pervasive as portrayed in the podcast [1]. These companies should be hit with huge financial penalties and the full force of GDPR should be dropped on them, but I'm sure by now, the largest companies have found loopholes to share personal information that can be used to market to individuals without it being considered personally identifiable...
One thing absent from the podcast however was an alternative. My partner on finding out about the data sale going on with period trackers (and having their mind poisoned with the concept of open source by me!) found Drip [2] which is an open source period tracker that's accurate, not exploitative, and not pink.
[1] https://www.privacyinternational.org/long-read/3196/no-bodys...