Hilariously I think you actually both did it wrong but it’s still a shitload of money that any reasonable individual could comfortably retire with. Billionaires have so much money that misplacing a few decimal places here and there hardly even matters.

400,000,000,000 x .0001 = 40,000,000

https://www.wolframalpha.com/input?i=what+is+.01%25+of+400+billion+

If someone dropped 40 million on me tomorrow I’d be happy to fuck off back to whatever rock I crawled out from under

Oobleck for the experience. It wouldn’t clean you, but you’d have a story. Possibly mild regret if it’s in a bathtub that you need to clean or a house who’s plumbing you’re responsible for afterwards.

I think it’s far more good than bad. He helped create a monster that he could never control. His monster was always going to be a monster with or without him. So at least with him going there’s a chance there will be one less skillful madman near the levers of power.