It's doesn't seem like much of a grey area to me. Presumably Flock serves the useful function of satisfying the third-party doctrine, making the surveillance they gather immune from 4th amendment protection (since I "willingly shared" my location with them by passing one of their cameras). If law enforcement has access to that data without a warrant it's de facto public to me.
FOIA isn't the same thing as having the data at my fingertips like LE does. I think the public deserves the same access LE has. If they can run ad hoc searches so should the public.
Personally I'd rather see all dragnet surveillance just go away.
> law enforcement has access to it without a warrant it's de facto public
I think the public would be entitled to the specific data that was purchased or accessed by the government, but absolutely not the entire corpus of broadly available data. What if law enforcement were required to "pay per search" a la PACER or journal subscriptions?