Before participating ICO make sure that they have duration when ICO ends because maybe participants will be suffer if it tales very long before the ICO ends. The minimum is 3 months and telegram created for questions to answer if they have question of investors or participants but maybe better for them to have specific months to end but sometimes they extend more weeks or months to reach the target to become successful.
I had a bad experience, when I joined ico gonetwork, where there was no information about the end, and at that time the campaign ran for 1 year, and finally scam. the participants did not get their rights. really make us feel angry, but we have to get up, at that time the last campaign was only listed TBA, and the manager replied, will be announced later