You got your answer, and you'll get it a million times. It's gambling. Anytime you bet on an outcome, it's gambling. As an aside I love how closely trading crypto and betting are comingled. It would be fantastic if Scottrade or any other discount stock brokerage had a dice option on their site.
It may just be right, yet something that promises victory it is gambling. all gambling have the same system and will never be changed, because the gambling system is actually like to benefit greatly from all the people who are addicted in gambling, but in a way that is difficult to guess. All gambling will give you a loss if you do your gambling in the wrong way