I have seen many failed projects too and nowadays, I see more failed projects than old times. I have received about 4-5 emails about Airdrop or Ico in a day. I will not invest ICOs anymore. If cryptocurrency's prices will go up to old high prices, I will think about it again but now investing cryptocurrency directly is better than investing ICOs
direct communication and seeing the reaction of their community is mandatory, don't be too skeptical of project failures, most ICOs who succeed in marketing choose to delay distribution or whatever to save their project. this is better than a fraud project.
I am optimistic about the ICO that I follow because the team of developers, and even investors, has a vision to continue to see the potential of the coin by looking at the right time for the next plan.