Why do you think good altcoins fail to keep going? It seems there are some that are good and people collectively have put in tens of thousands of hours supporting, but the team decides to give up midway.
maybe people are now smarter in choosing altcoin which not only gives an advantage in a short time or make altcoin only for profit and is not responsible
There are lots of coins and exchanges that any body can keep track off.
This is toxic to the crypto currencies as a whole.