The truth is that many fell to crypto and Bitcoin scams because they lack knowledge. More than anything, they are convinced by these scammers and their offers because they are not aware of what Bitcoin is, its basic dos and don'ts, its market, the movements of its price, and so on. Some may not even be greedy. Take, for example, those who are scammed by somebody who introduces himself/herself to be a staff and offers support assistance. Take, for example, those who are reading how-to guides or watching tutorial videos who were clueless of the wrong details provided.
That is true. If one person does not have sufficient knowledge on crypto, he will be forever prone to scams and even hacks as well. However, in many cases, the person who falls for a scam does so because of the psychological techniques employed by the scammer—and not because of some personal flaw. There are these universal principle of influence that scammers use to persuade people to do certain things. These includes: Reciprocity, Consistency, Social Proof, Liking, Authority and Scarcity. Here's the link for further details:
https://morrispsych.com/why-so-many-people-fall-for-scams-by-kenneth-freundlich-ph-d/