On console: Mw2 150gb warzone2 115gb Mw2s "cod hq" for launching games 50gb (the only mandatory one) Mw3 seems to be about 190 looking at articles. (For campaign, zombies and warzone)
They're starting to obfuscate where each thing comes from now with the Cod HQ Launcher to play off the size of the games. As well as let you delete components like zombies and campaign to "save space" that they hoarded.
Data points in the range of Gigabytes (uncompressed), the rest is unoptimized textures and models, duplications and other bullshit. Bet you could get 10 or so fps more, if they invested a few days for optimzations.
IIRC ark stores each model. If the island has 1000 trees, it stores the model of each of them, instead of having 1 model and copy-pasting it. Neither CoD not ark care a single bit for their storage needs.