You can't blame what some people think about him, he just brought this market to a new level, especially DOGE. It's not illegal, otherwise, he is arrested, but we know for a fact that it's called manipulation because he uses his popularity to influence the decision of the people, though in an indirect way.
Some of us may find Elon Musk tweets annoying or what he doing was messing up the cryptomarket. Making people follow whatever he mention like shilling Doge in his tweets which make Doge move from the previous standard to levelling up what Doge market standard have right now.
Now, we can't blame people believing Elon Musks because he has a power to attract because of his influence and because of his wealth.