Actually during the time of ICO there was nothing that could be done other than being mindful of them. Nevertheless, although ICO are gone, most IEO are doing theirs as well, that is, most projects after IEO, the price keeps dumping and the team suddenly going mute over their developments and before hand the project will be nothing to write home about. In my own opinion, whether ICO or IEO, let's always carry out our personal research, ask questions and so on as that is the best we can do.