Even though I agree with the underlying thought which is that people will be losing money, the moral is not entirely true at all imo.
First off there is the golden rule in crypto which is never invest what you cannot afford to lose so the moral of the story only applies to people that invest recklessly/ are basically gambling on random projects.
Secondly, from the story we can understand that monkeys are being bought and sold, well in crypto we are not talking about monkeys but we are basically talking about tech that can change the world ( literally ). It seems that the whole monkey business was a scam but in crypto there are many good projects out there that are not scams at all. Is Bitcoin a scam? Is Ethereum a scam? are any of the top 10 coins right now a scam?
Imagine investing in Bitcoin 4 years ago, would you be bankrupt now? Did the ' merchant ' disappear? Did anyone influence you negatively in any way shape or form because you bought Bitcoin?
Third and final, there are enough people that have paid off their house, loans and debts or have bought a new house/car/ real life stuff because of crypto and they probably would have never been able to pull that off if they invested in ' safe ' stocks or bonds or whatever not crypto related. IMO crypto is a big opportunity for everyone, if you learn how to capitalize on this whole crypto thing you might be doing just fine for yourself. but you have to put in the time.
Taking risks is what will be taking you to the next level, playing it safe will leave you where you are.