Corrected. It has an estimated 500 million MAUs.
Disney is a public company. It is up to the shareholders to decide if they want to sell if an offer is made. Boards tend to not have a ton of shares. Institutions tend to own the large percentage of the shares and they can about the dollars offered.
You could be right. Elon might have no interest (even if he could get financing). But do not be surprised if he makes a move like this.