"Is Elon Musk stupid?" - a question I saw posed recently. Yes, I know he's massively rich, but, like Trump, he inherited huge wealth (his father owned an emerald mine). He wouldn't be the first successful businessman to not be the sharpest tool in the draw.
A few items of evidence (there are many more):

The next one is my favourite example. I wonder what, PRECISELY, ruined Netflix for him. I really can't imagine, having enjoyed, for years, the vast choice Netflix provides.
The persecution he must suffer, from communism and woke! Really shocking. 🤣

Verdict 4 months on? I still think he's basically a decent guy, but after presenting himself as a "free speech absolutist" and saying that his Twitter crusade was against censorship, he then started banning journalists he didn't like, on the fly, like a kind of petulant social media Napoleon, which alienated even some of his fans.
Good NYT article from Jaron Lanier on Musk, Trump and social media behaviour manipulation.