马斯克，后悔了

Group 1 - The core viewpoint is that Elon Musk expressed regret about leading the "Department of Government Efficiency" (DOGE) and stated he would prefer to focus on operating his own companies instead [1] - Musk showcased a "DOGE" branded T-shirt during a media event at the White House on March 9 [1] Group 2 - The news highlights Musk's dual role as the founder of Tesla and SpaceX, indicating his significant influence in the electric vehicle and aerospace industries [1] - The mention of the T-shirt event suggests a continued public engagement with the cryptocurrency community, particularly related to Dogecoin [1]