The U.N. is a way to keep a thumb on the little countries, not a way to enforce anything against the major powers (i.e. permanent members of the security council).

As for the WTO, international surveillance is not a trade issue, it's a security issue. It's totally outside the domain of the WTO. One country's maneuverings for its security interests impinging the citizens of another country is the classic use-case for war.

I'm not talking about enforcing, I'm talking about having a forum for heated but peaceful discussion and dealmaking. I'm pretty sure US and URSS in the '60s and '70s disagreed on more immediate stuff than a generic right to privacy, and they managed to resolve many such disagreements through the UN at various points in time. For all the corruption that goes on in ITU and similar institutions, these are venues where issues at the intersection of technology and politics can be debated and progressed. Stuff like the monitoring of Petrobras for economic gain could also be configured as disruption of fair commerce under WTO rules. WTO processes, albeit very slow and clumsy, can have real repercussions on everyday economic activity. I don't see anyone going to war with the US because of some overzealous spying. There will be stern words, and somebody might see it as a good occasion to do away with the American dominance of stuff like ICANN and IETF, but I don't think anybody wants to deploy tanks to defend their routers -- not yet, at least