Project fails because:
1: team failed to follow the whitepaper
2: a member of the team harms the project development process by making an exit scam
3: external attack from hackers
4: bad market forces etc,
Ethereum blockchain came as a savior to the scalability problems faced with the Bitcoin network, and ever since then a lot of coins have come and gone. Going through my old wallet today I stumbled on some old and dead coins which at a time promised to offer so many good features and solve real-time problems but at this moment their nowhere to be found and are dead and gone with all the good ideas behind those projects. Some of which can solve some services issues faced in the industry today and this made me ask this question, which of the old projects will you like to see coming back again to achieve its original project idea to solve some issues facing the cryptocurrency industry at the moment and why do you want to see them back identify the real-time problem that coin can solve.