After taking on the employees and its CEO over Twitter, Musk has reportedly been introduced with a no-holds-barred work ethic, setting up in a most bitter "culture clash" with thousands of workers. For about less than a month, Musk has also sacked about a half of Twitter's 7,500 employees, axed executives, and engineers who did disagree with him. He had finally imposed an ultimatum: work which is extremely hardcore or leave.