Three quarters of Android apps track users with third party tools
This is a bit alarmist. I develop a popular app that has no advertising but I still ship mixpanel and crashlytics. I do that because I need to know how people are using the app in order to make the app better. That's it. If the app crashes and I don't know about it then I can't fix it and my users would hate me. Without these tools the apps would be worse.