- Find campaign managed by well-known Managers (Atriz, Yahoo, Lauda)
- If it's ICO, find out about their project, sometimes it is easy to smell bullshit project from their ANN topic
- Make sure campaign fund are escrowed
- If the payrate are too good to be true, it is
In addition to what has been said above by vlom, it also matters whether the project will be actually worth something or not.
Even if the project isn't a scam and pays the participants, the tokens paid could be worth nothing if the development of the project does not meet expectations / standards.
Then again, if it's worthless, at least it still has some value to it
Has there any ICO project that don't meet expectation and flopped completely?