and my question is Why? or is the risk involved in Bitcoin higher than gambling risk?
Really? No, mate. Gambling carries a higher risk than investing in bitcoin because the possibility of losing money is much higher than the possibility of getting money back, and again, if you lose, nothing will come back, whereas in bitcoin, even if you lose, you may lose a little from your investment and get some back, but in gambling, nothing will come back, so you can see that something that what you will lose may be small and you will get the rest back, and what you will lose all what you have been invested which one has higher risk.
Both are equally at risk if we cannot control ourselves. But gambling might be riskier because it can make us even more tempted to continue even though we have gambled enough. And the longer we gamble, we can lose more than before. But if you invest mainly in bitcoins, even if you are currently losing, you can still profit if you hold on to your bitcoins until the price increases again. So it is better to invest in bitcoin than gambling and only use it for entertainment and not profit.