He doesn’t have the final say because Arrowhead doesn’t own Helldiver’s. The IP is owned by Sony and they can do whatever they want with it. If Sony wants to make Helldiver’s 3 without Arrowhead they can. Sony can change anything they want about Helldiver’s anytime they want. Arrowhead didn’t know about the PSN requirement until six months before launch, that was a late addition.