It is good to invest in anywhere rather than make your money sleep in bank but regarding crypto the emergency fund shouldn't be invested there, In some countries exchanging cryptocurrencies make time long times and too much efforts.
I agree with that. It is best to invest the amount of money that you can afford to lose instead of putting almost all of your money into cryptocurrency. Investing is always about having discipline and risk management and not going all in because if you will do that then it will just ruin your potential to earn since you will be in panic if your investment is going down.