The cheater nightmare in Call of Duty: Warzone doesn't seem to end. The verification of the account via SMS should actually deter you, but this can be avoided for little money.
Call of Duty: Warzone's Free2Play model made it extremely easy to cheat when released. If an account was banned, cheaters could simply create a new one.
The SMS verification of the account should actually make creating more difficult, however verified accounts are now available for purchase in bulk online. They can be bought for the unit price of two dollars, whoever takes a lot gets a discount.
So the introduction of SMS verification only helped briefly and even there were cheaters who were seriously angry about it.
Account purchases received attention through a Reddit post. A user posted a screenshot of a seller there that explains how verified accounts work and can be purchased from them. Of course there are no refunds.
It seems that Infinity Ward is still unable to get the cheaters under control.