Yes it is true that you should not wait to invest in your emergency fund, because until he has some amount of money in his emergency fund, his investment may be stopped. investments running and to be able to deposit money into his fund.
It is wrong to start using your emergency funds to buy Bitcoin . Your emergency funds is kept as a stronghold of defense and a safe haven for your investments. It protects your investment from any unforseen occurrence that may likely happens in the future, although we don't plan for this things to happen but an emergency funds has to be kept as a strong backup in case of any real life emergencies. However what your investing on is Bitcoin and not your Emergency funds and reserve funds. Secondly what's is needed to invests in Bitcoin is your Discretional funds, Discretional funds is your extra cash after all your necessities has been taken care .