I think both of this are the same , once you invest , you already a gambler. In investing , you will be able to double or triple your profit if the ICO succeeded and the coin value goes high , its a high risk just like when you gamble. In gambling you will win or loose all what you have its a matter of luck and this is also too risky to do. Inveating ang gambling have the same aspects in earning profits.
Even at first glance it´s distinguished that betting is much riskier because you can lose everything in the blink of an eye,that's why it is not recommended and especially if you have little luck or talent in betting,however there will be some winners who are very lucky and know how to bet,but for those who are not like that should be much safer risk in investing I could suppose,which also carries risk but has more chance to exit when your investment does not go well,and if everything goes wrong you may have the opportunity not to lose everything which would be much worse.