What couldn't you do with NSA, Google, Apple, and Microsoft surveillance power? The answer to that is, "Not much I could not do once I had access to everyone's computers and phones."  Anyone who believes MSFT, Goog, and FB uses spy power to build profiles in order to recommend appropriate You Tube videos is living in fantasy land. Here is a short list of how anyone could profit by domestic surveillance. I would have:      1) ... an uncanny knack of coming in just a few dollars lower than the lowest  bidder for government or defense contacts. Oh, hell, why not just sell that information to competing contractors?    2) ...  what appears to be  supernatural power to know what people are paying their bills,  where they  live, which businesses are profitable and growing,  the names and banking  information of their customer or client lists, what the strategic plans are, and what executives have dirty little secrets to hide.   3) ... inside knowledge of conversations between Senators, Congressmen, and their stock brokers.    4) ... working knowledge of what all the web designers, programmers, and the people who employ them are doing and why. Products and ideas that look promising? I would simply take them and make them over as my own.   5) ... astonishing insight into what all the movie studios, record companies,  television producers, book publishers, pharma research labs, and news sources, the  DOD and the national intelligence agencies have in the pipeline.                      --------------------------------- Just five off the top of my head, without really thinking.