I know it isn't an investment, but in the last few years some "high risk" investment funds have appeared, and in them you can either lose it all or earn a lot of money.
Isn't this basically the same as gambling? Wouldn't it be faster to just deposit the amount in a casino? At least you'd be able to spend your earnings much sooner

It is investment in my mind, and there is investments where you sit and watch your money grow, on other side there is investments where you need to work for everyday.
Here is important what kind of skill someone have, its possible to make huge money on gambling, but I think skilled trader will do that better and with less risk.
I don't think it is investment with high risk but it is also like gambling whose possibility to give win is about 50-50% .
But in direct investment we needed to wait for long time for return of investment .