Shares of Alphabet Inc. (GOOG) tumbled nearly 7% on Monday, setting up for its worst daily drop in about a year, following the departures of key AI talent and rising competitive concerns. Noam Shazeer, Google's VP of engineering and co-leader of its Gemini AI models, is leaving to take a position at OpenAI. Shazeer had returned to Google in 2024 as part of the firm's partnership with Character.AI. Additionally, John Jumper, a senior exec at Google DeepMind, announced on Friday that he would be heading to Anthropic. The stock's decline was also influenced by comments from Satya Nadella, who indicated that the AI market is becoming more of a commodity and warned against depending too much on a few dominant AI players. Alphabet has been pouring money into AI, racking up around $141 billion through debt and equity financing since October.