The NSA targets Tor and Tails users. In fact, Tor was funded by DARPA and USN. Snowden documents and former NSA whisteblower Binney reveal NSA has problems with TOR, although can defeat elements of it through various attacks. The fact the US Gov funded it's creation makes it all highly suspect. I am no expert. Just my opinion on it.
I am not a technology expert, but Tor usage would not work for high speed trading. Plug-ins negate the benefits of Tor usage and the DL speed is just not there. upside: no annoying and eerie custom taylored ads.