Looking at the list of "Former Unicorns" on this page [1], I can't see many that fit your description. Sure, there's a handful, inevitably, but it's far from the norm. Most of them have grown into real businesses making real revenues. And sure, some of them may be still making losses but that's a valid strategy where there is still growth potential in the market.
Granted, Uber is a big question mark; it remains to be seen whether they will ever turn out to be profitable. But everyone knows what the strategy and the bet is, it's just a matter of waiting to see if the bet pays off. But no serious commentator could dispute that Uber's founders and present executives are talented people, building a company of substance.
So, if the claim is that it's commonplace for unskilled/disingenuous founders to build huge, successful-seeming companies just through huge sums of VC money being pumped in, then exiting and fleeing the scene before they get found out - there don't seem to be many real examples of that happening as far as I can tell.
[1] https://en.wikipedia.org/wiki/List_of_unicorn_startup_compan...
If you need mathematical proof for this, just ask yourself how many net new customers would you have to add to a business every year if you are at $100m in revenue and have an annual churn of 10%. Yep - you'll be running out of your TAM pretty quickly at that rate. And then add to that the fact that each new net customer will likely keep getting more expensive to acquire [1]. To get to $100m and stay there of even grow beyond that figure, the business fundamentals (first and foremost: churn) need to be good.
You can also think about it from this angle: why is it so rare for the same founder to continuously churn out one IPO after another? With each next attempt, they should be getting better at it and have more people willing to support them. The answer is - it takes a ton of stars to align correctly, and money alone won't fix your unit economics at a moment in time, let alone over many years and 100x growth in revenue.
This is nonsense. VCs do not have that kind of power to will something into existence. They can pour money into it, but they can't make a company successful. And if they continually spend more than they make...they don't get to stay VCs for very long.