Well, I like flickr because of the 1TB free space. I have tens of thousands of images there and still don't need to pay a single penny for all this.
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Regretfully, phone cameras are still significantly worse than decent MILC or DSLR ones, assuming both are handled by the same (knowledgeable - knowing what "sweet spots" are) person. They just can't deliver the same pixel-level sharpness and dynamic range than a decent dedicated cameras.
Yes, as you do state, for family moments, they're indeed adequate. For more serious shooting, not even the Nokia 808 is sufficient, let alone the iPhone.
There is nothing more serious than a picture of the toddler out in the yard on her first warm spring day to share with the grand parents. Virtually all of those are taken with cell phone cameras these days. For most people the subject of the picture is more important than all of the minutiae that 'enthusiasts' worry about.