What is the purpose of Espers?
The purpose of Espers is to enable services on the blockchain, for more info visit the website:
http://espers.ioso it's the purpose of other coins before espers. What is the unique purpose?
Do you think just because there is one anonymous coin, all other anonymous coins are worthless, or doomed to fail? That's not how it works, this is a free market. There can be different solutions to the same problem, with different characteristics, and time will tell which one is more practical, or easier to extend etc.