Given Flock's behavior to date, I really don't consider the assumption that they could move to selling collected data to be a conspiracy theory.

We have already seen that data is a highly valuable currency. And investor-backed companies with unicorn valuations are pressured to extract as much value as they can. All things considered, I would say that Flock continuing to monetize access to their collected data in new ways is a foregone conclusion unless it is specifically stopped or prohibited in some way. On top of that, I would wager that it may be already happening in some low-volume ways.