I need a way to make money too, but we have laws saying I can't do it by hitting you over the head with a club and taking yours. We also have laws saying Flo can't do it by lying about who they sell private data to.

I would advise anyone tracking medical data with an app to use something open source and local-only or network-optional if at all possible. I know there are open source cycle tracking apps, but I do not know if they're any good.