Without "companies & entrepreneurs", the government would have to build, fund and maintain their own surveillance infrastructure. This might be difficult since nobody would intentionally embed "NSAAnalytics.js" or use "NSABook", so covert methods will be necessary which are costlier and less effective at scale.
On the other hand, "companies & entrepreneurs" already built an industrial-scale, financially sustainable surveillance system that the government doesn't even have to pay for, and since it's not technically operated by the government, a lot of the legal protections against direct government surveillance also go out the window. Even better, while people may not use "NSABook" they happily do use "Facebook".