Not knowing too much about this space have you ever seen anything like this happen? A CEO using their personal wealth to cover their customers funds seems unlikely.
No, but I would love to see it happen, enforced by a court, and backed by a promise of jail time if the CEO fails to comply in a timely fashion.
He will have to buy equity or other product from FTX to infuse with cash. And if it is going bankrupt he has to stop running it to preserve the liability "shield" -- details of course depend on the country/state of organization/incorporation. I know nothing about the Bahamas.
Example: Elon for instance infused his own cash into Tesla, when it was going bankrupt. But he practically bought equity to my understanding.
Covering customer accounts is different, in a financial firm. I do not know what tools the Bahamas give to FTX. This is all uncharted territory. (Also there is legal exposure to other countries.)
It was the question that matters "how fast you can process user withdrawals and with what risk"
Sam owns 8% of Robin Hood that is worth around ~$1B - he could sell that and cover some of the gap. But what we do not know yet is the size of the gap in time and space. FTX had $6B withdrawals pending on Tuesday.