- Team and their experience (members should have public profiles on linkedin)
- Publicity of the Team (how freely they communicate, answer questions about project etc.
- Advisors if any (always a good idea to contact this person yourself to be sure that he is really advising particular project
- Check when the project website is created, and registered (also a quick method to suspect a scam project)
- Idea of the project (try to evaluate value of project by yourself, what perspectives it has, or is it just hype)
The list could go on and on, but this are the main criteria which i use to look for ICO with potential.
Most of these can be faked so, do a proper check in all.
1) In linkedin, try to send messages to all the members and see if they reply. If you do not get any reply, those profile may be fake.
2) Regarding website or domain age, the project can easily buy a old domain and build a website on it. Even if they create the website a month before, you will see registration date as 4 or 5 years before. Proper way to check this is through wayback machine which allows you to check how the website exactly looked in the past.