Most people don't invest in Amazon or Netflix or Bank of America. They invest in basket products that contain algorithmically curated mixtures of all those things. They're designed so that the losses are always slightly less than the gains. Money never goes away. It just moves from one ticker symbol to another.
If the money ever does go away, the Fed pumps more in. Risk gets undervalued, pickers get more aggressive, and the whole thing keeps bubbling upwards.
Now, if the $600 unemployment checks are suddenly removed for any length of time, we could see another "AIG" type event where all the ghost debt stashed around makes an ugly appearance.