SpaceX is a fantastic company full of the smartest engineers that has brought fast internet to the most remote regions on Earth. Even if it wasn't for index funds, investors would buy the shit out of it.
xAI has built an almost-frontier model. It's not Anthropic or OpenAI but it's also not valued like Anthropic or OpenAI either.
Twitter is doing OK, despite predictions. It found a niche with obnoxious right-wing assholes instead of obnoxious left-wing assholes. Twitter does seem to be less excited about getting people fired for wrongthink than before which is a societal improvement. It did succeed in buying Musk influence at the highest levels, but he threw it away. Mixed success.
I know Musk gets a lot of hatred on here for his behavior and beliefs, including from myself, but that doesn't imply that his businesses are all scams. Hugo Boss was a Nazi too and his business is doing fine.