A very good question. DGMarket is based on the Steam platform architecture because it is (probably) the only platform that provides the "API", a system that developers can communicate with.
In order for DGameMarket to support other platforms, you have to add a lot of games manually. It's possible we'll do it someday.
Remember that the games included in this post are a different project than games in the market.
RE: Store offer: 2018-08-15