If this goes through, it'll be a game changer. I really was hoping a similar push from Epic considering they've pushed for alternative stores on mobile platforms and also can offer competitive pay shares to devs that use Unreal; but titles that joined its mobile store are very limited. They're cool titles for sure; but Steam really has a chance to compete really hard with this news. And Epic has no excuse of "no we can't use that backend Steam uses to translats games"; it's literally open source.