>but bringing the price down by simply ignoring laws and regulations their competitors are required to abide by.You're right, in a lot of cases (Taxis vs Uber comes to mind) the government has created these sub-optimal local maximums with its unnecessary regulations and industry protectionism. Technology is the big energy input needed to break free and move to a new maximum.
When I use Uber, I get much more value than I ever did with a taxi. Not only does it cost me less, but it's faster, the experience of ordering is painless, the cars are nicer, the drivers are honest, and there's accountability for bad drivers. Uber is most definitely creating value.
More generally, new ways of doing things displace old ways of doing things. If you're a company doing things the old way, adapt or die. That's progress. In capitalism, the destruction of old business models is as essential as the construction of new ones. They are two sides of the same coin.
Addressing your argument again, lots of the businesses being displaced were basically profiting from regulations that kept out competition. He who lives by the sword dies by the sword.
As for your general point that the valley isn't really creating much value, remember that all of those wild valuations are just risky speculation by a small few, given that there's no open market for buying and selling shares in these companies. Risky speculation is a valid investment strategy for a portion of your wealth. Beyond all of the hard-to-believe valuations, there's also thousands of small technology companies making small profits and providing real value, but not getting any media attention.