Really, is gambling a fastest way to double your crypto ? It maybe not in many cases where people win in gambling but it is a fastest way to get lose of all of your money. It is not easy to say that anyone who come in gambling will be rich instantly but it is very common that people come in gambling and become more poorer than before.
It is both a fast a way to win and lose your money. In gambling you are trying your luck to double or triple your money. You are taking a risk and you are getting a reward based on the risk that you take. What you should remember is that the casino is always going to win in the long run because the game is an EV- game. The casino is fair, it does not cheat on your rolls but mathematically simulated version of any strategy will be a failure in the long term.
Again the reason behind this is that any strategy made is actually based on a wrong assumption that the bankroll is taken to be infinite which in reality is not true. Think if it this way - A person with an infinite bankroll, why would they gamble at all?