No, Call Of Duty: Black Ops 6 Isn't 300GB
Briefly

The estimated file size was technically incorrect, as the preorder pages did not accurately represent the real download size.
Black Ops 6 can be 300GB if players install various other Call of Duty titles and content packs alongside it, not the average player's installation.
Players can selectively install parts of the game, such as multiplayer or campaign components, and delete sections to save space.
Treyarch confirmed that the Black Ops 6 campaign length will be typical for a Call of Duty game.
Read at GameSpot
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