The problem is not MrBeast or ethics in these cases, the problem is the army of followers that these types of people have. In my country, a fairly well known YouTuber (I think he calls himself Dallas or something similar), but not as well known as MrBeast, did the same thing a few months ago, launched 2 tokens and the same thing happened both times, many people lost their investment in a matter of hours. And the problem is that people believe anything and fall into the same trap again.
There is a very used saying for this type of thing, I will translate it as best I can: "If idiots did not exist, those who deceive idiots would not exist".