I'm not saying this with the intent of harshly criticizing the author, but I admit it's surprising to me that someone (who had other options) would work for 14 years at a company they clearly came to believe was making the world a worse place.
I think Google has a culture problem (they're massive, doesn't apply everywhere, etc. etc.). There's a weird sense of internal entitlement where some (likely a small, but still substantial) number of people work there, are well paid, and yet act internally as if it's some terrible place doing terrible things (yet stay working there). Whatever way they rationalize this to themselves - it's odd. I don't have first hand…
This criticism doesn't just apply to DeepMind. The reason that he is mentioning them specifically is because was an early investor so he has access to their team.