I don’t even use iCloud Photos and this was on by default. Very bad move by Apple to ship my photos off my device, without my permission, in any shape or form, I don’t care.
It’s funny how the wordsmiths come out to defend Apple here.
Your “photos” aren’t shipped off-device without your knowledge, just an arbitrary blob of ”metadata” that you can’t audit describing everything about that photo. :)
It’s sort of like “I don’t want my WiFi router uploading my house online!” And someone replying “it’s not your physical house, just a map of the house and the real time location of everyone in it! The house never moves!”