1. They are frozen. Like how Oars, an ancient giants died of being frozen
2. Rocks himself is the one that says that Harald commanding the Ancient giant Galley La could end the world.
3. And Jarul is the one that says Harald Eating the Elbaf fruit could end the world
that’s 3 point from the Manga One Piece. That’s my proof from the manga.
Your proof of whatever you believe is “well cartoon logic” or whatever the fuck