It is impossible to detect 100% of scams. Bitconnect traded for months and fooled thousands of people. EOS is a scam yet peaked at number 4 in marketcap and had the most successful ICO ever. It still has a daily volume of $800 million. The obvious scams are easy to pick out. The elaborate scams which will fool the most people are the ones that are the most difficult to detect.

By having a group that screens every project, you inadvertently present the idea that any project that makes it past the group and is posted on the forum is legit, when in fact, it could be one of the biggest and most elaborate scams yet. For the same reason that the forum doesn't moderate scams, I don't think it would be a good idea to try to moderate which ICOs can be posted. I can already picture hundreds of threads in Meta saying "I invested in a project approved by this forum and I got scammed - I want my money back".