I figured that $2.99 tracker blocker app was junk money, then it caught 4,000 pings in a week
I finally installed it on my phone 6 months ago and the log showed apps pinging location data every 90 seconds, even ones I barely open. What finally convinced me was watching it block a weather app from grabbing my contacts at 3am, but now I wonder if I am just trusting one app to spy on the other spies?