People should never think about the emergency funds could be used for their investment in future. But rather people should think about using this fund for emergency situation like to cover their finances if they experience situation where they lose their income and other health emergency situations.
That's why this fund should be not touch since this could save them on actual emergency cases that might happen to them in future. Better for people to forget about this fund and use their discretionary income for investment just like what they currently do on Bitcoin.
The decision to invest with an emergency fund is a completely wrong decision, the main purpose of an emergency fund is to provide financial security in unexpected situations, but what will you do if you face an unexpected situation after investing with this fund? You can never say that you will never face an unexpected situation. Unexpected situations are normal, so if you spend the emergency fund on other things, your financial security will be weakened. And when you need money, at that time you will have no other option but to sell your holdings, as a result you will have to face losses. That is why, keeping the emergency fund aside, you should invest only that money, which even if lost, will not have any impact on your daily life. An emergency fund is your financial security, so if you remove financial security, you will have to face financial disaster.