I recently got a hand-me-down Android device which I performed a factory reset on and then set it up how I like it.
But I've been noticing every once in a while that there are new apps installed that I never installed. Sometimes they're games, sometimes they are non-game apps. Usually they are things I've never heard of, but I've seen a few popular apps such as TikTok. In any case, they're always crap I'd never install.
I don't know if this is a "feature" like how Windows 10 will put new things in the Start menu every so often, or the perhaps more likely scenario that this device has some kind of rootkit malware on it that allows it to install apps without my permission and can survive a factory reset.
The previous owner of the device was not very tech savvy and it wouldn't surprise me if she had installed some malicious app disguised as a game from the Google Play Store which set this behavior in motion.
But I also haven't had a new Android device since 2013 so I'm not sure if this is intended device vendor behavior.
The device is a Motorola Moto Z2.
Any useful suggestions or solutions on how to stop this behavior would be appreciated.