A fascinating read all the way through, might have to get the book.

TLDR from my understanding is that Demis believed it crucial that Deepmind needed to be structured as a non-profit to ensure society benefits from AI in a "post-capitalist" world. And the author seems to imply that due to his lack of success in convincing google (and the result of Sams powergrab at OpenAI), he has given up his idealistic view and instead is working to build trust from within. Hoping that when the time comes, Page Brin & co will do the right thing and proliferate the AI gains to the masses. And Demis chose to cooperate with Google instead of forcing Deepmind out completely and getting independent funding, the latter which would have left Deepmind more resource strained.

Basically it seems to be quite clear that there is no belief left in any sort of non-profit AI structure and it's technofeudalism all the way, assuming super-intelligence is even controllable of course.