ICO - Initial Coin Offering, the most famous way na ginagamit ng mga scammers in crypto industry, at isa sa mga dahilan why price drops when lots of reported due scam  ICO, gives a bad representation to people who just heard crypto/bitcoin, gives lots of opportunity to bounty hunters and signature advertisers *quality posters and spammers, and etc.

About naman sa IEO sa pinaka mabilis na sold out just try to see this result from OKEx's IEO, then you judge https://twitter.com/OKEx/status/1115959170975567874