I completely agree that there doesn't seem to be any obvious readon why Galaxy Store should need access to your contacts to function. I very much doubt it has anything to do with sharing, as you can easily share links in Google Play without giving it access to contacts. But I disagree with your point that this is a violation of privacy. The very fact that you have to grant the app permission means there is no violation. The app can only access your contacts with your consent. The fact that it doesn't work at all if you don't allow the permission is terrible but it still doesn't violate your privacy because you have the choice not to use it.
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