Android 7.1+ has a “Panic Detection” Mode that Detects Frantic Back Button Presses:

While many readers of Android-centric websites such as our own are less likely to come across situations where a rogue application compromises their system, the same may not be true for the general population. Nearly every week we hear from various security researchers about new malware targeting Android users. Most of these malicious attacks can be avoided by inspecting permissions or avoiding installing sketchy-looking applications, and while we do recommend our readers take their phone’s security into their own hands, Google is responsible for securing every Android phone. To that end, the company quietly introduced a new security feature in Android 7.1 Nougat called “panic detection” which listens for multiple back button presses in succession then returns the user to their home screen.

I hate all the malware on my iPhone.

Oh yeah, I never have to deal with malware or “panic detection”.

Open always wins, right?