Ivy Liu For the remedies phase in the Google search antitrust trial, the giant has subpoenaed three of its biggest AI rivals — OpenAI, Perplexity AI, and Microsoft. The subpoenas, sent in October, were made public on Monday through legal filings from all four companies. The disclosures came just hours after the Google ad-tech antitrust trial wrapped up closing arguments from lawyers representing Google and the U.S. Department of Justice. When asked for comment, Google and Microsoft did not immed...