We all are well aware of ICO
frauds.
I use the strategy to start with a whitepaper, see team member details and the roadmap.
What strategy you adopt to make sure the ICO is not a scam/fraud?
Nobody is immune from fraud and hackers in this technology. There is no regulation and this is used. Usually you need to analyze more than the road map and the soft cover of the project and the number of participants and the team. But again this does not give a full guarantee that you will not be deceived.