Ethereum is probably the most successful ICO. Out of the ICO's which have launched much like startups less than 10% survive and yes many were also scams. Some e

Ethereum is probably the most successful ICO. Out of the ICO's which have launched much like startups less than 10% survive and yes many were also scams. Some examples of succesful ones though are MakerDAO and Synthetix. Both have successful running products which generate large amounts of fees. It is more common now for a project to distribute tokens after it has a running product to incentivise early users and integraters. ICO's still happen but are oftne restricted to venture capitalists and registered investors.