Apple hold the data in iCloud, Apple (or a phone network) may be leasing me the phone. That sounds pretty similar to the Flock situation.
I guess the difference is that flock might be sharing the data from a customers camera with other customers. Then they are definitely controlling it.
I think the bigger problem with Flock is the fact that their cyber security is so laughably bad that non-customers can easily access the data.
For example, would you want to be able to tell Public Storage (or some other storage unit place) to remove any naked photos of you stored anywhere in their storage units?
For them to actually be able to do that would require they have nigh omniscience on everything stored by/for everyone in every one of their storage units. Even inside closed boxes.
Now, it's not the same thing of course - but hopefully you understand what I'm referring to?
I was enumerating the likely defense, not that it's valid.