Your list of who uses what is kind of contaminated by who wrote the code, I don't think it proves anything. Obviously Google Brain use TF and Montreal use Thea

Your list of who uses what is kind of contaminated by who wrote the code, I don't think it proves anything. Obviously Google Brain use TF and Montreal use Theano - they wrote them. Deepmind use TF, but they used Torch before the google takeover. Similarly Google and Toronto are deeply intertwined.