[ad_1] Microsoft CEO Satya Nadella, right, greets OpenAI CEO Sam Altman during the OpenAI DevDay event in San Francisco on Nov. 6, 2023. Justin Sullivan | Getty Images News | Getty Images Tech giants aren’t doing much acquiring these days, due mostly to an unfavorable regulatory environment. But they’re finding other ways to spend billions of dollars on the next big thing. Amazon’s $2.75 billion investment in artificial intelligence startup Anthropic, announced this week, was its largest venture deal and the latest example of the AI gold rush that’s prompting…