In casino gambling there is usually a guaranteed win for them because they have an edge on their games while in crypto it requires strategies and skill to top up your game.
Investing is considered gambling because you are taking a risk with your investment, especially in a highly volatile market, but the difference is you can cut your losses in cryptocurrency, while in gambling you can totally get wiped out.
I consider both as gambling, with playing in casinos considered high risk and investing in cryptocurrency low risk to medium risk. Either way, you have to understand the risk and only invest or play with money that you can afford to lose.