Like all fields where the rules are not clear, scams are easier to implement.
However, I am convinced that most projects have failed mainly due to incompetence, not by ill will. The altcoin crisis was positive because at least it allowed us to do some cleaning.
Yes, in the beginning, all the projects that were made confidently by the developer and the team had a goal, but one day when a crisis hit, the team did not have the experience to deal with it, which made the bad intentions appear in my opinion, or was tempted by instant money.