If you get tokens on ICO, that means the ICO project has already worked ? Or you can still get tokens from failed projects ?
Even a 5 years old project can still tank - because the members decided to prolong the scam to maximize profits or any other reason that might make the project to fail. You should understand you are investing in a business idea - and 7 out of 10 business fail in 10 years. Bitconnect is a good example of a failed top 10 project that is more than a year old with a working product.