First of all, ALL the oaths for paladin except Oathbreaker are about serving some level of good...
Oath of Conquest says hello.
I'm going to make my whole party into Bards now, we're going on tour, our band is named the Eardrum Flayers.
Oath of conquest is not in BG3.
Well, you did say "all." Did you mean "all two of them?" I dunno what WotC did with D&D 4e, but in 5e there are no alignment requirements for classes. An Oath of Devotion paladin, arguably the "goodest" paladin, can be Chaotic Evil. Which, sure, seems a bit at odds with some of the language used to describe the paladin class in the PHB.