Nothing, but I guess I don’t have to tell you that, since your question seems rhetorical in Nature. However, what keeps BTC from crashing is the same psychologi

Nothing, but I guess I don’t have to tell you that, since your question seems rhetorical in Nature. However, what keeps BTC from crashing is the same psychological effect that keeps Twitter, Facebook, Nike, or Coca-Cola from crashing: Brand awareness. Bitcoin sucks compared to many other cryptocurrencies, still it’s the most popular one because it was the first, because people know about it, and because people know that other people know about it. Even if you could fork Twitter and put it behind a different domain name, for example , Twutter, and you would add some functionality that everybody would like to have (let’s say an edit button), most people would still go to Twitter. If you could sell the rights to use the name Coca-Cola or Nike, even if you had to make it clear to the customer that the new product that you sold had nothing to do what so ever with old product, the names alone would be worth a couple of fortunes. So what’s stopping Bitcoin from crashing is the brain virus (or meme if you want) that has infected hundreds of people around the globe and made them believe that other people will know about and believe that Bitcoin is valuable. And since Bitcoin isn’t hooked up to a doomsday device like Luna and UST was, it can’t destroy itself.