Actually, you've provided examples that prove the point. None of those were especially good (though everyone wanted the G4 Cube), and yet they made it to market anyway. Why?

Because the CEO was behind it, breathing down their necks.

Pretty much every example is considered an abysmal failure that often costed the actual workers their careers while their CEO carried on.

If you consider that outcome a worthwhile endeavor, I don't know what else to say.

He's definitely not talking about worthy endeavour.

He's talking about an endeavour reaching the market.

I'm sure if Zuckerberg wants to spend $10B on Nuclear Fusion it will happen.

It’s fission, not fusion:

https://www.esgdive.com/news/meta-inks-nuclear-deals-terrapo...

…and if they do all of this, it’ll be closer to $20B than 10!

If all it took to get viable fusion power was a FAANG CEO with $10B to burn, I'd be first to petition for it to happen, and even throw whatever money I can spare onto that pyre.