Government is always asking technology companies for backdoors so that doesn't seem like news to me, but you may well be right that it's never been documented before. To me this doesn't seem any different from the Chubb lock company teaching spooks how its locks are put together or somesuch.

I have no opinion on whether they're spying on American citizens, I have always assumed they would do so sometimes in the course of spying on other countries' citizens. Foreign spies seek agents and unknowing assets in their country of posting so that just seems inevitable. So what?

I have to say that a lot of the response here seems very theatrical, albeit unwittingly so. Going back to the lock analogy, I'm sure the CIA has some of the world's best lock pickers and burglars on their payroll, but doesn't mean the CIA are trying to break into your house, does it? They could break into your house, if you embarked on an affair with a beautiful spy (or even a sort of frumpy one) they maybe would break into your house, but realistically they probably have zero incentive to do so right now.

It's really hard for me to give a shit about the CIA possibly-in-theory-maybe spying on people when you have government organizations like ICE actually plucking ordinary people off the street and putting them in detention centers where the normal rules of arrest and imprisonment don't apply.