Aren't neuralink and boring private corporations? Aren't billionaires allowed to throw money at whatever they fancy, and these kind questions specific to only public corporations?

They are undoubtedly allowed, but the question is important because OP mentioned Neuralink and Boring as things Musk "shipped".

Demos of existing tech are even better than what Nikola has.

In general yes, but the Solar Roof Tile thing is still vaporware despite the demo.

> Do neuralink or boring have successful products? or just demos of already existing tech?

Are complex, difficult, expensive products or services usually built and launched quickly? Do they occasionally require long cycles of iteration? Maybe the iPhone should have been thrown away at version one.

It's 2005, does the Falcon 9 exist yet? Geez, we're waiting. It's obviously all vaporware, a fraud, they could hardly launch the Falcon 1 without it exploding every time.

It's 2009, does the Model S exist yet? Geez, we're waiting. It's obviously all vaporware, a fraud, they'll never mass-manufacture electric vehicles.

The Boring company was also a fraud the way it was originally presented. Musk sold it as this unique new technology they were making, when in reality they had bought some 3rd party machines and flown them in from China.

More of a joke than deception. They sold flamethrowers for heaven’s sake.

Hyperloop isn't a fluke?

What's the fluke part exactly? It's perfectly doable, but the (risk-weighted) costs are just enormous.