The damage to the US economy and tech industry caused by this sort of thing seems likely to outweigh any supposed security benefit. Celine's First Law: "National Security is the chief cause of national insecurity." [1] Related stories on HN recently involving Twitter et al [2] are enough to make one wonder how long before some of them relocate overseas.

[1] http://en.wikipedia.org/wiki/Celine%27s_laws#Celine.27s_Firs...

[2] https://news.ycombinator.com/item?id=8422581