I don't believe that investing all your money in crypto is more dangerous than investing in anything else. THere's always a chance of failure in everything you do. You can fail by getting cancer and dying, being killed in your car while driving home, getting robbed. To me cryptocurrency offers a very high probability of success. Much greater than real estate and other so called safe investments. When you're poor you have to take risk or you will never achieve anything.
I agre with this quote because I definitely believe that in everything you must have a fallback. It's not that I meant that you're gonna fall but what if you change your mind? At least there's something left that you can use in other way to earn profit. Above all else bitcoin is still developing so you can try another way of earning.