Could it be simply that millenials have always assumed that this stuff was going on, this they aren't surprised or particularly worked up by the revelations?
This is sort of where I am. Given that I have known about ECHELON for oh, 15 years at least and basically look at the NSA as the organization that does explicitly this, I don't see why people are shocked over the PRISM leaks. ECHELON to PRISM, the only thing that changed is they got better and people willingly put disgusting amounts of information out there.
I just figured it was the mobs lack of long term memory.