Cheating has been an issue in multiplayer games for as long as they've existed. Cheating is especially bad in battle royales for a couple of reasons. For one, players encounter one another only briefly (rather than over the course of an entire deathmatch or similar mode), so it's less likely they spot a cheater. Secondly, victims may move on to their next game too quick to even notice they were felled by a cheater. Also, popular battle royales have massive playerbases, so it's hard to stay on top of all the cheaters within. Call of Duty: Warzone, specifically, has had major issues with cheaters since its release.
Back in April, Activision released a statement regarding what they'd be doing about cheaters moving forward. Activision states that "Warzone has zero tolerance for cheaters." To that point (Apr. 13), Activision had already made 70,000 permabans, and Warzone had only been out for a little over a month. Despite their actions, Warzone still has a problem with cheaters.
In the video below, popular streamer TimTheTatman falls victim to a player using an aimbot. Aimbots allows cheaters to automatically lineup shots on enemies from any distance. The crazy part of the video happens shortly after (around 5:40) when TimTheTatman begins spectating the cheater that killed him. The cheater then tunes into TimTheTatman's stream and answers questions by nodding yes or no on his screen.
In the video, we see the cheater use his aimbot to get some ridiculous kills. He hits players that seem to be miles away, and even kills people through clouds while they are dropping from the sky. TimTheTatman asks the cheater a series of question regarding how long he's been cheating, and if he is afraid of being banned. Surprisingly, the cheater is unafraid. TimTheTatman sticks around for the entirety of the game, until the cheater eventually gets the victory. The cheater puts on his mic at the end, and reveals he has been cheating for six months. Activision still has a lot of work ahead if they plan on eradicating the cheating problem in Call of Duty: Warzone.