As a side note, and as an artist myself: Artists do not “own” an art style. Marathon’s art style is not stolen. Brutalism in graphic design existed since the late 1990s. Monet doesn’t “own” impressionism, Dali doesn’t “own” surrealism, Warhol doesn’t “own” pop-art. They never have. Anime and manga have been using that art style in their design and marketing for a very long time. Anime being a pretty big influence on Bungie during the time they were making old Marathon, Halo CE, and most obviously, Oni.

Maybe you should look up what happened.