evidence: The battle between Elon Musk‘s Twitter and Mark Zuckerberg’s Meta over the launch of Threads — Instagram’s Twitter rival — has taken a legal turn. [...] In a July 5 cease-and-desist letter addressed to Meta CEO Zuckerberg, a lawyer representing Twitter said that Musk’s company had "serious concerns" that Meta "has engaged in systematic, willful and unlawful misappropriation of Twitter’s trade secrets and other intellectual property." The letter said that "Twitter intends to strictly enforce its intellectual property rights, and demands that Meta take immediate steps to stop using any Twitter trade secrets or other highly confidential information." [...] Musk, in a tweet responding to news of Twitter’s legal threat to Meta, said, "Competition is fine, cheating is not."