I think it is because they didnt do some research before. They dont have enough information o how is the background of this community, how is the team, is it trusted or not. We must have some strategy, which is better and yes dont be greedy too.
it is primarily greed and fear of missing out, and then you do not have time to do the research, because you think that you will miss it out, and you enter without thinking
when it is something to good to be true, it is actually almost in every case to good to be true, and it is not true