You cannot apply equally to all exchanges and to all IEO projects. We have already seen that nothing is perfect in cryptocurrency. Very large sums of money are being collected uncontrollably in ICO and IEO projects, so there will be periodic deceptions, frauds and major conflicts. While cryptocurrency is only developing. Perhaps in the future we will see new forms of fundraising in order to issue new tokens. In the meantime, it is necessary to note exchanges that deceive investors and try to use them less often.