That's not true at all. In fact, I would argue that bitcoin price is more predictable than most other assets. It is hard to predict the future price of, for example, a company, because it is dependent on earnings reports and company performance, which can be hard to predict if you don't have insider information about the company. Bitcoin, however, has no intrinsic value or standard mechanisms for determining a fair market value. This means that it is driven purely by investor psychology. As a result, it very nicely follows many commonly found technical patterns. The price is driven by group psychology. Sure, news events affect the price as well, but the price is more deeply tied to investor psychology than any fundamental value (which is in contrast with stock price movement).