Vegapunk has created a robot army, the strongest beings ever, methods for traveling the calm belt, a mythical zoan fruit, and probably countless other inventions for the world government because left me check he wants to “help the world”
Then you also have Fujitora who knew about the seraphim and how the Gorosei have the ultimate control over them based on the unknown info. I'm thinking there will be some failsafe to them down the line or something. We shall see.
Otherwise, Oda needs to do a proper justification of VP creating these insane weapon.