Vitalik is also a human just like us. No matter what the reasons might be, he just wanna dump and take all the money with him. That's why I don't know why this trend is always there that if someone is known or not sends millions worth of crypto to an exchange, it's always in the headlines.
It's his money so he can do whatever he likes. He is certainly an ETH whale, but moving his coins to Coinbase doesn't necessarily mean he's gonna sell them. $1 milly is a good amount though.
Yeah, although I am sure that he's rich enough. He can sell whenever he wants and if he's in need of more money, he can always get from his ETH stack.