It's not that they don't do anything, but they just fail to complete it because they lack the abilities or resources. They underestimate the scope of their concepts.
You're right! It is often possible to observe how projects promise to realize some ambitious plans, but then they do nothing except spend money collected from investors for entertainment. I hope that team Greencoin is not like that.
You can promise a lot, describe everything beautifully and gradually collect money, but in the end it may not even come to realization