I think Google's solving a pretty different problem, low-latency communications over a quite heterogeneous network, where they don't control the lower-level inf

I think Google's solving a pretty different problem, low-latency communications over a quite heterogeneous network, where they don't control the lower-level infrastructure. HFT firms typically have a narrow range of configurations they have to work over and control the setup of their pipe; they aren't trying to ship technology that will work over every random person's DSL line and funky NAT setup.