You do understand that icloud is a private storage platform which is fundamentally different from Facebook/Instagram which are used for publicly sharing photos?
Okay? I don't work for Apple, and I'm not making any judgement or sharing my opinion, just answering the question that was asked in a way that I hope was objectively factual with little editorialising.
I will state though that Google Photos has in-servers CSAM detection, and Dropbox. You can have your own opinion about all of that.
