The whole mission of Coinbase is legitimizing cryptocurrency when you break it down. They are like Windows 95 to the internet, it is how many people will use the market.
People also asking why a company would go to the public stock market when they are an alternative market, well part of it is to legitimize it and reduce the chance for regulation. Once enough people are making money from it then it becomes harder to put back in the bottle. It is also part marketing, many people will for the first time hear about cryptocurrency soon because of it even though it has been around a decade+. It also makes the investors rich and fuels more cryptocurrency investments. This event alone will create many wealthy crypto entrepreneurs.
Coinbase is like cryptocurrency being merged into Wall Street main/master on git. This is the moment that truly merges the Wall Street investment world with cryptocurrency, for better or worse. The roller coaster has reached the precipice, no turning back now.
