I do not think that scammers have a strong negative impact on investors. Investors have learned to research projects and learn how to choose promising ones. So I think that Scam soon does not remain. Investors become are smarter.
The smarter investors get, the smarter the scammers get as well, they have devised numerous ways to brighten up their project, making it look legit and attractive to deceive investors into investing in it. And definitely it's working as so many are still losing money through scam projects everyday, despite the numerous research made prior