I used to invest in ISO and make a profit. Recently, a lot of coins in which I invested fall down after entering the stock exchange. I do not know what to do about it ...
I consider those coins that failed to get a listing as scam coins, it's part of the roadmap, investors are investing because they want to trade the coins in the market, if the ICO does not have a plan to get listed in exchange in their roadmap, people will not invest on it.
therefore we also have to be careful in choosing good coins for the future, it is true that now many ICOs are deceiving but that is not all maybe only people who have no satisfaction so they are not fraudulent.