I can't speak for all of high tech, but my experience was that we encrypted everything on the phy itself. All data was encrypted via hardware before it left the host and was never decrypted until it reached its endpoint. If the endpoint was one of our devices, it was again decrypted in hardware.
Outside of this, I don't expect Google, fb, etc to ignore court subpoenas. That is not a tech issue, it's a government one (if there is really any issue at all).
I can't speak for all of high tech, but my experience was that we encrypted everything on the phy itself. All data was encrypted via hardware before it left the host and was never decrypted until it reached its endpoint. If the endpoint was one of our devices, it was again decrypted in hardware.
Outside of this, I don't expect Google, fb, etc to ignore court subpoenas. That is not a tech issue, it's a government one (if there is really any issue at all).