Sort of related, the company whose website this blog post is on makes the best Android PDF reader, and it's free: https://play.google.com/store/apps/details?id=com.pspdfkit.v...
(Disclaimer: I am not associated with the company)
(Disclaimer: I am not associated with the company)
>full network access
>run at startup
>prevent device from sleeping
Guess is they're selling user's PDF reading activity data.Prime offender: Amazon Music. Latest rev AFAICT has no "Quit". Have to resort to Settings->Apps->Force_Stop to get its clutter off the screen.
Disclaimer: I've used the company's SDK fairly extensively in my own product (but I'm not otherwise affiliated with them).