I guessing people are concerned about the width and breadth of the potential searches. We've seen at least the US government have some fairly expansive request

I guessing people are concerned about the width and breadth of the potential searches. We've seen at least the US government have some fairly expansive requests in order to track down one single person, and they never delete the data once they obtain it. So a copy of those records will forever be outside of your control, potentially without you ever knowing it.