Unlock the Editor’s Digest for freeRoula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter.Microsoft has given up its seat as an observer on the board of OpenAI while Apple will not take up a similar position, amid growing scrutiny by global regulators of Big Tech’s investments in AI start-ups.Microsoft, which has invested $13bn in the maker of the generative AI chatbot ChatGPT, said in a letter to OpenAI that its withdrawal from its board role would be “effective...