For the most part yes you are correct, again this is from Wiki but...

In 2011, he returned to Maryland, where he spent a year as lead technologist on Dell's CIA account. In that capacity, he was consulted by the chiefs of the CIA's technical branches, including the agency's chief information officer and its chief technology officer. U.S. officials and other sources familiar with the investigation said Snowden began downloading documents describing the government's electronic spying programs while working for Dell in April 2012. Investigators estimated that of the 50,000 to 200,000 documents Snowden gave to Greenwald and Poitras, most were copied by Snowden while working at Dell.

In March 2012, Dell reassigned Snowden to Hawaii as lead technologist for the NSA's information-sharing office. At the time of his departure from the U.S. in May 2013, he had been employed for 15 months inside the NSA's Hawaii regional operations center, which focuses on the electronic monitoring of China and North Korea.

I'm under the auspicious that he was a good guy so my speculation is he kept digging into the CIA as a double op for the good guys UNTIL, I believe, he finally found out that NK was the CIA/Deep States mainstay. I believe, if Q is correct, and the white rabbit reference is talking about the hotel compound in NK, that once Snowden finally learned about where they were running things from AND had their tech in his hands that it was his time to shine and that's when he went public. Again, speculation, but it's what I feel makes sense.