Is this really a surprise to anyone? We've known that the N.S.A. has gotten (or coerced) support from communications companies in the past, and AT&T in particular (the article mentions it going back as far as 2003 https://en.wikipedia.org/wiki/Room_641A).
Did anybody really think it stopped when the secret room was uncovered in 2006? Telecom companies make no promise that your traffic is protected. It's up to you to protect yourself.