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.
Not totally the biggest man in the cryptocurrency though. Anyway, in my point of view people follow Elon Musk simply because of what he accomplished, he's a smart guy, and looking at how successful his businesses are. One thing I could also notice from him is that he's very close to the people or approachable like he can ride with the memes and whatsoever unlike some billionaires but most importantly he is an interesting guy. That is why when he entered Crypto it caught more attention especially when he mentioned DOGE and Bitcoin.