Running an authoritarian police state is risky because of all the people involved in the authoritarian police state, also it's massively expensive to keep all those people snooping and you have to take them out and kill them on occasion because they learn too much.

But wait, you can just dump that information into a superAIcomputer and get reliable enough results while not needing a break with little to no risk of the computer rising up against you. Sounds like a hell of a deal.

Quantity is a quality in itself.