No amount of "we were briefly a huge multinational" will compensate for a fundamentally unsound business.
Sooner or later the free money is going to run out and Uber is going to have to stop hemorrhaging nearly a billion dollars every quarter. When that day comes they're not going to have a lot of options to stop the bleeding: raising prices and cutting back the markets they operate in are likely to be the first things they do, or are forced to do by investors.
Meanwhile, the way you build a huge multinational is by first figuring out a way to make money and then scaling it to everywhere, not by figuring out how to be everywhere and then realizing "crap, we have to actually turn a profit now".
They are growing revenue faster than their losses and they are profitable in mature markets. That sounds like a fundamentally sound business to me. The cognitive dissonance you're suffering from is the inability to believe that investors will take on losses on the order of a billions of dollars to build a profitable business. Millions of dollars are okay, but changing millions to billions and people are like "that money has to run out eventually". That's not how investors operate. If the opportunity is on the order of billions of dollars as well (maybe trillions), investments of billions of dollars isn't that big in the grand scheme of things. What matters is that the size of the opportunity is large and that revenue grows faster than losses. So long as those two things are true, there will be no lack of investors willing to pony up the money to be on that gravy train.
I do not believe Uber's future value to investors is equal to the amount of money already put into it, let alone orders of magnitude higher (and "trillions" of dollars -- as you suggest -- is laughable).
Sooner or later the free money is going to run out and Uber is going to have to stop hemorrhaging nearly a billion dollars every quarter. When that day comes they're not going to have a lot of options to stop the bleeding: raising prices and cutting back the markets they operate in are likely to be the first things they do, or are forced to do by investors.
Meanwhile, the way you build a huge multinational is by first figuring out a way to make money and then scaling it to everywhere, not by figuring out how to be everywhere and then realizing "crap, we have to actually turn a profit now".