Key Takeaways One of America's legendary tech founders has a warning for AI investors: They can't all be winners. "Not all of these valuations will end up going up. Some of them will go down," Bill Gates, co-founder of tech giant Microsoft (MSFT), said of AI stocks in an interview with CNBC on Wednesday. "It's going to be hyper-competitive. A reasonable percentage of those companies won't be worth that much.†Microsoft is among the tech giants whose massive investments in artificial intelligence have fuele ...