Apps ask users to place their finger on the Home button to take a heart-beat reading. App dims the display to minimum to hide the content — which is actually dialogue requesting authorization for in-app purchase.
Similar technique found in December 2018:
Scam iOS apps promise fitness, steal money instead | WeLiveSecurity
Fitness-tracking apps that have appeared on the App Store use dodgy in-app payments to steal money from unaware iPhone and iPad users.
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