It could also be a balance force.
If you’ve been in the hollow knight community you’ll likely of seen hollow knight PVP. One player tries to beat the game normally (the game was originallysingle player, this is a mod), the others try to stop him.
Now in their community it’s the one ending.
But if this idea was extended to it’s own game then you could give the single player multiple endings, multiple win conditions, in order to force the opposition to spread out untill they figure out your plan, while the opposition has one, that being stop the player.