EDIT: OK I didn't read the article, that's my fault. But the original point stands: I don't want Apple run more scans on my phone. They can scan on Cloud, but not on my phone before it's loaded into Cloud.
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I want to add that this may be a serious issue for people with young kids. Imagine you shoot a video/photo of your kid with little dressed on. Now what happens? Are we supposed to fully dress kids because we have no idea what Apple will do after the scan?