Give credit where credit is due. This is DeepMind's research, and Google acquired them in 2014. Of course, Google gave them a lot of resources to train AlphaGo. But let's not bury the subsidiary, or I guess they would both be subs to Alphabet now making the two even less related.
According to the pre-match interview[0], the AlphaGo project is about two years old, and started out as a collaboration between two members of DeepMind and a member of the Google Brain team (Google's deep learning team which pre-dates the DeepMind acquisition by several years, according to Wikipedia). So really, AlphaGo is a combined effort that was always a part of Google, and I think it's pretty clear that resources provided by Google (money, equipment, and tooling) in addition to the techniques developed by both Google and DeepMind made this project a reality. I think they both deserve a lot of credit, certainly, but I wouldn't say that the credit is all that misplaced here.
