How can it be huge spoilers? In almost every game it is very clear who is winning before gg is called. AoE very very rarely has "clutch" wins and even then the player cam is not always telling.
Also i believe nili said they tried to synch but obs didnt allow for it.
Of course it can be a spoiler. If you "see" the gg on cams just as a big engagement is beginning then you know the player that's trying to catchup lost the fight.