Forum admin wouldn't allow any project they know as a scam to advertise, but AFAIK no scam project would announce they are scammers before they start to run their project, so the forum leaves the decision to invest or have any business with any project in the hands of members of the community, that's the reason why you hear that "scams are unmoderated by the forum".
Neither was I saying they all are bad, my thread was in a bid to seek ways to only see the few good ones, I know it's a difficult task to do and also I've read everyone's reply till now, it now seems more impossible, but for me when I pick altcoins to invest in, I only choose the reputable ones in the market(as I suggested in the OP).