Earlier quoted context omitted.
There remains no evidence that the NSA is deliberately flouting the law. If there were, Snowden would have leaked that instead of lists of hacked Chinese computer systems.
I don't understand the timeline you're implying. Snowden did blow the whistle on this program, in 2013 . Your link was from 2015, and now it's 2019, if I'm not mistaken. Snowden has lost the access he had before his whistleblowing. It will take another whistleblower to reveal the scale of current unsupervised malfeasance.
Secondarily, you're not understanding the leaked documents. The leaked documents showed that the NSA believed that the phone metadata program was legal. Once there is a court ruling that it is illegal, its lawyers cannot justify the program.
Thirdly, your phrase "another whistleblower" shows that you do not know what a whistleblower is. Leaking thousands of programs where just one of them happens to be illegal but not obviously so (to the point where Snowden was far more interested in PRISM, an obviously legal program) is not whistleblowing.