Tech mogul Elon Musk intensified his legal battle with ChatGPT-maker OpenAI in the days after Christmas. Court filings show two prominent tech investors lending support to the billionaire’s allegations that the company unfairly blocked potential backers from investing in its rivals.The dispute between the world’s richest person and one of the world’s most valuable start-ups sets up a potential court battle over OpenAI’s future. The artificial intelligence developer is trying to restructure itsel...