Often have I delt with making a cedh lobby and have this happen. A new player joins (which is perfectly fine) not knowing what cedh is. Or a more casual player joins gets mad at you for going kinda off on turn two then blocking you. both situations are hella awkward when they happen. With leagues everyone has skin in the game its expected to be competitive. I know you said this wasn't popular before. I feel like that would change this time around. I jam well over 50 cedh games a week. Interest in the format is only growing.