What negative comments? Just like likes can be purchased (cheaply) negative comments can be expunged. If you remember the subway bread yoga mat scare in the last couple of years the blogger who did that has a team of moderators that just go out and find people who they think might cause problems in the future and bans them preemptively. With a scam artist who has relatively little reach and exposure someones chances of finding out about them before it's too late are still pretty slim. Con men are in the business of coning people because it's a sustainable business for them so long as they manage to stay out of jail.