Tesla CEO Elon Musk claimed on social media that the backers of the Stargate Project, including Softbank, don't actually have the money.The Stargate Project aims to invest $500 billion over the next four years in building AI infrastructure for OpenAI in the United States.The project has received support from companies like Oracle, Nvidia, and Microsoft, and has already begun construction in Texas.Elon Musk and OpenAI's Sam Altman have a history of public clashes, and Musk alleges that Softbank has well under $10 billion secured for the project.