The giants of Elbaph worship the Sun God, Nika. The World Government was to erase anything and anyone connected to him or the Void Century. Doesn’t take a socially awkward One Piece fan with too much time on his hands to figure out Elbaph’s days are numbered!
But why hasn’t the World Government destroyed Elbaph already, you ask? Simple. They can’t!
Elbaph is an island full of warrior giants, for one. That’s more than enough to give the World Government pause. Then, there’s the island’s location in lawless/Yonko territory. Sure, that’s another big problem but Elbaph has been around for centuries, right? You’d think it be worth it to the Five Elders and King Im to destroy the country hundreds of years ago. So, again, why not?
Mammoth Base Opera Castle 