i wouldnt say trading is unpredictable, it jjust need a great knowledge in what are you trading and trends of the market, be updated with the news, same thing happens with bitcoins, price depends on the market, some trends, like china and its position with bitcoins, the movement of the market, sales and buys and some other factors that can be reflected in btc prices. So the most important it s to know how to interpret the market trends
Those people who think and consider trading as unpredictable is just new to trade world
Yeah they think really hard to make money here they prefer to gambling instead sometimes
But once you have mastered trading , have a lot of experiences you will have different thought
Trading was so easy predictable as long as you not being greed.