The easiest way to stop ICO scam,is first not to invest that kind of hoax project platform,second  is to inform all part of your community,or some of your friends who belong in this cryptocurrency bussiness,that you feel something fishy of that ICO project now  come out in the market,third is  research that kind of project if its legit  from the white paper,the staff,road map that all of there presentation is genuine,so otherwise you can find a good ICO if that project is marketable and the community manager is good communicator,so thats why to stop this scam ICO is to filter it and to determine its been  a ponzi or legit project.