Oh boy. Is that a serious question?
wow, what's wrong with surrendering in the first turn, for example when you have no chance?
Well . . . if it's a custom game, a diplo game, etc, these are often created with a goal for each spot. 1 slot is supposed to be OP, 1 slot is supposed to be underpowered, some are meant to be mediocre, etc. And when 1 player just T1 surrenders, balance is skewed.
In other FFA games, there's simply the matter of someone surrendering means those around that player are either rewarded (empty lands to easily snag) or punished (player goes AI and attacks you when you were previously perhaps safe), etc.
In team games, you are an absolute jerk if you T1 surrender without consulting your team. Actually, it's pretty jerky to surrender on any turn without consulting your team. You individually may not have the vanguard role, but even a player with 1 territory and getting only 5 base income can make a difference in a game. Sometimes you have to be the pesty gnat, you need to be the speed bump, in order to facilitate the greater cause.
And if you can't handle that, don't join those games. Joining and surrendering T1 is obnoxious.
And if it's a modded game or a mega game . . . well **these cost actual coins to make. SOMEONE PAID COINS for the slot you consumed, so T1 surrendering is just super rude.
**these = 1 free modded game for non-members per week BUT some players might pay 2 coins/slot for a 2nd game per week; all mega games cost coins, just a matter of how many