I agree with Otithes. There's a difference between people who say "gg" or "well played" and concede because they've acknowledged that they were going to lose and people who concede abruptly and leave the table without saying anything. The latter is what happens on BGA, and it is like an immature child storming off because they couldn't handle being defeated.
I'm not a fan of people who concede, and I make a note to not play with them again. I was particularly frustrated when a player conceded during a Seasons games. I don't play with the promo cards often, and I'm still learning how to use them effectively. This was my chance to learn how to use them right (especially since you get different cards for each Seasons game, and I never knew when I would get a chance to use these promo card combinations). Instead of letting the game play out, my opponent conceded and abruptly left the table without saying anything. There's games that I've lost by over 200 points, and I still stuck around to the end.
It's different if there's an emergency or something that seriously prevents a player from finishing a game. But conceding when there's only a few turns left seems immature and silly.
