Seems oddly specific blaming Call of Duty, when it's far from the only game with huge patches, and far from the only massive game that launched late last year where patches were being delivered almost daily. Red Dead Redemption II on the PC being one other major source of bugs.
But, the size of the patch doesn't directly affect bandwidth, which it sounds like they lacked. The thing that affects bandwidth is the number of users attempting to download the patch. Larger size only prolongs the effect..