Huh?
In a market nobody's "allowing" things or not, people simply choose to purchase/invest or not. Losing money has always been acceptable in every business ever because businesses require investment and investment takes time (months, years, decades) to pay off.
Why shouldn't you allow an unprofitable company to IPO? He's arguing that I should be prevented from buying shares in Uber or Yelp no matter how badly I want to? That's incredibly presumptuous of him to think he knows better how I ought to invest my money than I do.
> Here’s to a new generation of entrepreneurs who prioritize building sustainable businesses.
Nobody would be investing money in these companies if they didn't think there was a good chance of them becoming sustainable long term. Obviously, the board of Uber is doing their best to make it a sustainable business. (You may disagree that it's sustainable, but that's business -- you can disagree about everything.)
Essentially, the author appears to be anti-investment, which is basically anti-economic growth broadly.
Bizarre.