Call of Duty: Warzone has implemented a new requirement for free-to-play players that should cut down on the number of cheaters.
Following the example of CS:GO and other free-to-play games, Call of Duty: Warzone now requires two-step SMS verification for its free-to-play players on PC.
This basically means anyone who doesn't own the full game must tie an active mobile number to their profile, which they'll be receiving a SMS message on, similar to how two-factor authentication works over email.
For now, this is only a requirement on PC, but it should make the process of creating new accounts much harder for cheaters, since they'll also have to buy a new line every time they get banned.
Security Update: We have initiated two-step SMS authentication for new #Warzone PC users, who log in as free to play as another step to provide an additional layer of security for players.
— Infinity Ward (@InfinityWard) May 12, 2020
This is obviously not an entirely foolproof solution, as burners exist, and so do sites that generate temporary mobile numbers. But, it's a step in the right direction for a game that's been struggling a bit with cheaters.
Just last month, Warzone started matching cheaters with other cheaters in separate lobbies. Infinity Ward also recently updated its player-reporting tools to allow everyone to report cheaters through the spectator view and killcam.