Full disclosure: Footpath does currently collect an analytics event when a screenshot gesture is invoked (absolutely no screenshot data) to decide whether to present a share prompt, and it had the unintended side effect of revealing suspicious account activity. I've already updated the code to remove the event in the next release.

I'm happy to answer any questions about privacy and the data Footpath collects: https://footpathapp.com/privacy

And publicly disclosing user screenshot counts and times is extra creepy.

This was the most surprising part of the article for me. I had no idea an app publisher could tell when I had taken a screenshot.

(I don't use iOS myself; I assume if it's possible on iOS it's possible on Android as well?)