With Playstation less relevant in Japan than they used to be, there's little sense in keeping a Japanese franchise exclusive to their platform.
Exclusivity in general is growing scarcer nowadays as dev costs rise, with even first party Sony and MS games releasing on competing platforms.
FF in particular is a brand that has lost a great deal of its selling power over the last two decades, so if they want to stem the bleeding it makes sense to give it the widest release possible.







