Out of curiosity, the Clevermining states the following:
We automatically exchange all mined coins into Bitcoins and pay out entirely in Bitcoins for your convenience.This is the Clevermining's Guldencoin deposit wallet on Bittrex:
https://explorer.guldencoin.com/#/address/GQsUGhJiKTA35ysmVDMsASHPdXWxbDoqoNAt this moment over 3.7 million Guldencoins aren't sold, all those Guldencoins are mined with the help of your users but didn't reach the Bittrex exchange. Clevermining is stacking up, can you justify this toward your users?
Possibly the cause is that it is not easy to sell them. Let's be honest, who in her sane mind is going to give away good, valuable bitcoins in order to buy that shit? I am surprised that there is some market at all for those scamcoins.