Any time you see someone who is interacting constantly with chat while also destroying in game, they are likely cheating.

Most of the major Tarkov streamers, for example, are using ESP so that they know when they can interact with chat safely. Most of them are smart enough not to use that information to obvious advantages in firefights, but it does become obvious when you see them bantering with chat and then suddenly go silent and lock in before they encounter someone.

Magnus Carlsen was talking about chess cheating and saying that if he were cheating nobody would ever know, because he's good enough that all he needs is a tiny bit of information at key moments to shift the game, he doesn't need to be playing engine moves. The same is true of top streamers.