People follow him because he is the biggest man in cryptocurrency What he says happens. Is one of the people and when he speaks it is clear and easy.
He is a successful man in cryptocurrency The coin he talks about gets his price up. a few days ago he tweeted about dogecoin and check his price where are you. I think that's why people follow Elon Musk.
many people follow the words of Elon Musk because he is an influential person in the world and he is also one of the richest people in the world. so it was natural that many people followed what he said. and Elon Musk not only spoke, but he proved and spent some money as capital to buy Bitcoin and Doge.