I'll make a period tracker for you for 5 bucks a month. You won't buy it, because it costs 5 bucks a month. So I'll have to find alternative monetisation strategies.

I think that kind of thinking is similar to the "both sides" stuff in politics. There's a meaningful difference in trustworthiness between different options.

For instance, if you need to track your period, the built in iOS apps are secure, especially if you're using advanced icloud encryption.