Pretty much every major skin releases overpowered to bait purchases and the come week 3, once sales have peaked and complaints are rife from non-owners, they then nerf the gun as some positive PR. Whilst the owners are then busy crying that their gun is weaker now, Activision releases a new bundle a week later so people move on to that knowing their latest bundle is worthless. I think dataminers found about 11 straight instances of this occurring between MW2019 and Warzone prior to them getting DMCA'd and after a slight downturn in this concept with Vanguard due to a lack of interest, it's now happening because MW2 offers huge potential for this. Content creators were even able to predict the exact week a bundle would launch and then the exact day it would be nerfed it got so predictable.
It follows this basic formula - expensive P2W bundle released > player buys bundle > players dominate with said bundle > bundle gets nerfed > new P2W bundle gets announced > players (forced to) buy new P2W bundle > rinse and repeat. If it was just cosmetics, then Activision would barely scrape 20% of the business they are doing right now. There's the odd-quirky bundle here and there with some new animations, effects and finishers but the premium £24.99 bundles are a completely different story.