Regardless of what one thinks of Snowden, there's zero chance that Oliver Stone is capable of making a movie that's honest.

As for Snowden himself, I don't know what his actual motivation was. Could be a desire to out the truth, could be the desire to embarrass the US government could be that he got paid, dunno ... I suspect he thought he'd do some minor whistle blowing, get a little famous, write a book, do some TV interviews, bang some models/groupies and then descend into obscurity with a fat bank account.

I'm glad we know about the illegal surveillance of the populace by the NSA, but because of the damage to foreign intelligence (including the death of some assets) there had to be a better way to leak just the NSA stuff without making a mess of everything else.