I don't know why people say bitcoin is gambling. Its not gambling. You are investing your money and time. You use your internet. So its not gambling dealing with it.
Bitcoin is a currency. You cant say money is gambling itself. But if you invest your money and convert it into bitcoin, now it is gambling. Because you take a risk investing your money to a volatile currency hoping it would rise up in the coming days, but you know it might also drop. There is still win or lose in it, so basically its still gambling. The process is gambling, not bitcoin itself.
Yes bitcoin is gambling in the other way. But for me it is not gambling as you used it as an income of your money. For example you just here in forum and start from nothing until you earn money from joining in the signature campaign. Many people says thats gambling but they doesnt have any proof on it. To correct you, not all things that you used your internet doesnt mean that it is gambling.