Just about any multiplayer game will be infected with hackers and cheaters at some point in its lifetime, and most of them struggle with this issue indefinitely. Call of Duty: Warzone managed to rack up over 30 million players in just two weeks, and there are quite a few bad apples in that crowd.
As the game continues to grow its audience, more and more reports of cheaters are flowing in. Warzone is a standalone expansion for Modern Warfare, and shares the main game's anti-cheat software. While in MW's traditional multiplayer you are playing with relatively small groups of other people, encountering cheaters is less frequent.
On the flipside, Warzone is entirely free-to-play, meaning banned cheaters can hop right back in, and you're sharing the battlefield of Verdansk with 149 others in each match, meaning you're much more likely to encounter hackers. Players have been recording instances of cheating, showing how they're disrupting matches.
Call of Duty: Warzone cheaters are employing hacks typical of competitive FPS titles: wallhacks, aimbots, speed hacks, zero recoil and they can also always see the location of every other player on their map - sort of like a permanent UAV Killstreak.
Here's a video showing the hacks in action:
We do not endorse the usage of hacks. Cheating in Warzone is detrimental to the game experience and isn't allowed by the terms of service. Using cheats will lead to a ban.