Ah, yes. The “let’s bloat our game size to bully other games off your SSD so you’ll be reluctant to ever uninstall it, because reinstalling it would be a big pain, that way you’ll play it indefinitely and give us extra money in micro transactions” strategy.
They are probably using DirectStorage to increase game performance, that means that the only compression available to them is GDEFLATE. And that’s not the most efficient algorithm for photo like images as used in textures.