We receive information about suspected ICOs from investors, members of the community and also from some websites that advertise ICOs.
And also we do analyze some new icos listed/posted on this forum.
Here are two interesting topics that you should read:
Guide - Some useful additional tools for SCAM ICO detection
https://bitcointalksearch.org/topic/guide-some-useful-additional-tools-for-scam-ico-detection-4802067
And this one:
Guide - Prevent scam!!! Seven useful tools for find scam / fake ICO team
https://bitcointalksearch.org/topic/guide-prevent-scam-some-useful-tools-for-find-scam-fake-ico-team-4586576