Investing in ICO's and online gambling both pose risk or are risk taken events. Both can end you up without nothing in your portfolio but the difference here is that, whiles you can't get your money back in online gambling once you lose, you can really get something meaningful only if you invest in proper ICO's. Though you have to wait for months with ICO's to make profit, online gambling is instant and personally, it is worse involving in online gambling than investing in ICO's.