 its role as an observer on the Artificial Intelligence Company's board. The surprise departure comes amid intensifying scrutiny from antitrust regulators of the powerful AI partnership. Microsoft has reportedly invested $13 billion in open AI. European Union regulators said last month that they would take a new look at the partnership under the 27 nation bloc's antitrust rules, while the U.S. Federal Trade Commission and Britain's competition watchdog have also been looking at the pact.