You literally just answered the question yourself how scammers convince people to invest into their projects from the first statement you made above, which is literally as a result of "greed, ignorance and due to lack of understanding to what Bitcoin truly is and stand for". Because normally speaking, when Bitcoin started within the first and second bull, people didn't knew much about it, which led them falling victim to scams, and as time went on within the forth and fifth halving, people started started getting acquainted and understanding fully what Bitcoin is, of which I'm pretty sure that in this current 2025 Bitcoin bull run, it will be hard for ordinary Bitcoin investors falling victim to scams.