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Why is Google allowed to remove purchases from our Play Store accounts without telling us?
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Because you signed (digitally) an agreement that lets them do that.
Pirate everything.
Also, don't use Google. Wherever possible.
If you have an Android, they are increasingly making it impossible to not use them. They continue to punish users that choose to unlock the bootloader or root, and Google Play Services are an inescapable prerequisite to many apps, regardless of side loading ability.
I've used F-Droid without unlocking the bootloader or rooting or Google Play services integration. Developers are free to use F-Droid, most just choose not to. Hopefully it becomes even more popular as gplay has more issues.