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Google’s ‘Secret’ Update Scans All Your Photos
(www.forbes.com)
This is a most excellent place for technology news and articles.
The Graphene devs say it's a local only service.
Open source would be better (and I can easily see open source alternatives being made if you're not locked into a Google Android-based phone), but the idea is sound and I can deny network privileges to the app with Graphene so it doesn't matter if it does decide to one day try to phone home... so I'll give it a shot.
God I wish I could completely deny internet access to some of my apps on stock android. It's obvious why they don't allow it though.
Check out Netguard. It's an app that pretends to be a VPN client so most of your traffic has to go through it - and then you can deny/allow internet access per app. Even works without root.
You can, if you root your phone. Unless it is not a thing anymore.