Shouldn't the dev be focused on building the game instead of a new cryptocurrency?
The dev is focused on building the game, his newest project Heroes is suppose to launch near the start of September. The purpose of Jewels is to fund development for his large scale upcoming project called Rebirth. Apex and Heroes simply demonstrate to us or well at least to me that the dev is competent and knows what he's doing. His past shows me that he knows how a community, cater towards the gamers playing his games and monetize it successfully.
I don't see why he would spend development time building a new cryptocurrency when he could leverage an existing one instead.