If he could manipulate the market with a few tweets and make billions out of it, then I wouldn't call him a clown. I would rather call him superman. It took Warren Buffett many decades to make the amount of money that Elon Musk made in a few hours with his manipulation of the cryptocurrency market. IMO, he is one of the most intelligent billionaires out there and I won't be surprised if he becomes the richest person in this planet very soon. That said, I don't think that what he is doing is something very ethical.
The guy is a clown there is no doubt about it. Also his bipolar behavior is very unpredictable. Mix that with a narcissistic ego and you have a bomb cocktail. Many will get burned with this guy, it's just a matter of time.