I think you're going to have a hard time with this...

Flock seems to leave the data in ownership of the government. They are just providing the service of being custodians for storing and accessing that data.

You probably would get a similar response by submitting your request to Amazon web services or Google cloud or whoever has Flocks data: "sorry, we're just holding the data on behalf of Flock"

In either my example case or your stated case, you would have a very hard time convincing the host business to destroy their customers data without a court order or court case that shows their policy is invalid and they must comply.

Not a lawyer, just noting the parallel.

I do appreciate that Flock's response says that they cannot use the data they've collected for other purposes.. which further reinforces my cloud storage analogy -- the cloud vendor can't look at your data you upload to storage to e.g. build profiles on you/your business.