I agree, but if they want to make something of their store, this is the only option open to them at this point in time. Their store/launcher/whatever is severely lacking in features at the moment, so no one is even going to give them the time of day if they can just get War Shooter 13 on Steam, alongside all the other games they already have there. It's a gambit. They're betting that by the time the exclusivity runs out, they would have actually made something that people would habitually check to see what is currently on sale.