not all IEO give you profit and same happend with ICO too
and not all major exchange that hosting IEO can give assurance for profit
that why you should double check your investment
Of course, many exchanges require quite specific information from developers when conducting IEO, which reduces the risk of a fraudulent project. In addition, the developers of the new project must make a certain contribution to the exchange, which is equal to 20 Bitcoin. On this basis, investors have a lot of chances for success.