Played from the beginning for a couple years. Cheaters were an issue because they didn't show your death via the opponents 'kill cam'. So you didn't know if it was an aimbot/wallhack, or an oversight that you made in positioning, making sound, or just a lucky shot by the opponent. So you have to stick around and spectate the suspect, but that player gets notified that he has in-game spectators and (if he's smart) toggles off or just goes looting and avoids combat until he has no spectators. The game is built on 'just one more drop' mentality, so no one sticks around anyways, and cheaters ran rampant.
The most common cheating is mimicking gamepad use with kb+m inputs. This is prevalent in any shooter that supports controllers and provides 'aim-assist' to help casuals frag from the couch with a gamepad. But many streamers have been busted in Apex or other shooters for doing that: input speed and precision kb+m with in-game auto-aim.
Apex has done a lot over the years to improve the cheater situation and I have no idea where it's at today.