This is the opinion of @Blacksmith21 who is pretty good at this stuff...  If what i have read i correct, snowden knows where the "bodies" are buried in the form offensive cyberweapons, bank accounts, digital dead drops etc. The photos of ES locations may be to either scare or flsh him out or to let him know there are whitehats watching to keep him safe as he helps dismantle DS cyber ops. essentially hesbeen flipped. most likely to save his own ass. (tech upgrade complete soon)