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Period tracking app refuses to disclose data to American authorities
(www.newsweek.com)
This is a most excellent place for technology news and articles.
Biowink GmbH is probably not a corporation registered under US law. If I had to guess, the government of Germany will not be particularly eager to force them to turn over data to the USA. The Germans take their Datenschutz very seriously.
They've already taken the hard stance. If they roll it back, they will lose the trust of their users.
I'd still echo the (current) top comment's advice to use something open source, local, and encrypted.