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Android won't kill sideloading after all, but new verification rules will make it harder
(www.techspot.com)
This is a most excellent place for technology news and articles.
I think whatever is required for third party apps and stores should also be required for play store. No special treatment for their own files.
Eg: "Warning: Are you sure you trust GooglePlayStore.apk? This software might be harmful."
I reckon that Google would magically get the messaging exactly right with that requirement.