IPO is usually done in conjunction with stock exchange while ICO is done in the cryptocurrency market. As far as I know, no company can launch an IPO without first proving its worth and without passing all the legal requirements set out in the law so as to protect the investors. While in ICO being under an unregulated and decentralized platform anybody can launch an ICO anytime anywhere....a situation opening floodgates to scammers and frauds. When you buy an IPO you are basically buying a stock of the company and therefore entitled for company dividends now the same thing could not be true with ICO otherwise the project can be flagged as selling security and can be against the law. I am then hoping that soon we can see ICO evolving and advancing so that we can weed out scammers and that investors are not only protected but can be earning something out of the money they invested even if the value of the ICO is going down in crypto-exchanges.