1. graal does no advertisement so word of mouth is the way it gets its players(i would say most pc players dont tell people they play graal)
2. most good pc gamers prefer challenging games/competitive community not chat rooms
OT: there are many things that can be done to improve pc graal but I doubt anything will be done since the priority is ios graal. I think most developers spend most of their time on ios servers or their own servers that probably wont go anywhere.