In the video on the announcement page, there was a short scene where they showed a Zoom call where the results were announced. I counted 20 people. The paper th

In the video on the announcement page, there was a short scene where they showed a Zoom call where the results were announced. I counted 20 people. The paper they published in Nature has 1 authors, so it matches up. Probably this is not the precise team size, but gives you a rough estimate. What's important is I think which people they hired, as well as Deepmind-internal infrastructures. You can just walk over to one of the world experts in deep learning and ask them how to address some issue. In pharma companies they have people who are really smart about drugs and biology, but ML experts would all have to be hired externally, and likely don't represent the top of the field as well as Deepmind does.