What happens if I’m a billionaire and I buy 95% of a certain crypto supply?

Weird question here but I was wondering what would happen to a crypto if a billionaire like Elon Musk or whoever just happened to be dumb enough to buy most of the token supply of a certain crypto?

Let's say it's July 2013 and Mr billionaire decides to buy up 95% of the supply of our favorite crypto at $80 a coin. because they see the potential and understand markets..

What happens to the price then? Does it shoot up to 100k a token and he can make profits and sell to whoever wants to buy?

Because from what I understand, market cap is based on how much money is in the project..

Anyway, I know it may be a stupid question to some, but I'm genuinely curious.