Legal or not, this is plain creepy. For those who don't use Shutterfly or Facebook, knowing our faces, found on random backgrounds of photos, are being scanned

Legal or not, this is plain creepy. For those who don't use Shutterfly or Facebook, knowing our faces, found on random backgrounds of photos, are being scanned and analyzed without even our implicit consent (by not having these services at all) is simply mind-blowing. I don't know how these companies can make this consensual or not. If they scan a face that opted out, then that information of "not opting in" is stored somewhere, so even to opt out, you have to be implicitly opted in once. I think the issue is that these companies actually believe people don't want or value any sliver of privacy. I really don't understand how this is different than government dragnets.