I'm not sure why we care what Andreessen thinks. I wish I had a downvote.
Second, he seems to be saying Snowden is a traitor because his revelations are hurting the US tech industry. I can see why that would make Andreessen feel betrayed, but that is hardly the definition of traitor.
Third, as others have said, nobody was surprised the NSA is spying. We're surprised it is conducting pervasive electronic surveillance in the US. (Personally, I'm horrified although not surprised by the scope of the spying outside the US. I would strongly support extending privacy protections to everyone, as unrealistic as that idea is.)
Finally, if we're going to get definitional, Snowden is certainly a traitor. He clearly broke the law, betrayed the trust placed in him and it seems very likely he would be convicted of treason. However, I also think he did the right thing for the right reasons.