Cod is like fifa. If you play one title you pretty much played all of them.
I say everything released after COD Modern Warfare 2019 can pretty much fall under "expansion".
It is not for me but there are people who only play COD and spending $70 annually to get the newest content of the favourite game is really not that big of a deal.
I also have seen zero ads, which struck me as weird. But also, I bet they count free game codes to content creators, sponsored streams and the like,so maybe a lot of the money was spent targeting streamers, tick tok and YouTube—a bunch of the people I subscribe to have been hyping cod zombies. Granted many of them played warzone a lot so it didn’t seem that weird to me.