Well there are no projects that will start as a scam right away they should be identified first, you really wouldn't know not unless they have a plagiarized whitepaper or a team that has a fake identity. All I am saying is if the projects are in your list you simply need to monitor them as some of them might be discovered as a scam after some time. IMO this will really be a useful feature for your aggregator and this might be one of the unique things where it will gain your some visitors of your site.