Hi, all 3 points are very valid. I do also want to add another one. They may have a real world application but how do they challenge the incumbent or market leader. Will they get any adoption or if yes, will the adoption increase to a level so that the project survives?

Creating a decentralized amazon for example is great but how much time will it take for a company to reach where amazon is in terms of tech. Moreover, to an average person, what matters more - cheap goods delivered to the door by amazon or goods delivered on a decentralized platform. Amazon may not be the best example but hope it makes my point clear.