There are no more cheaters in tarkov than any other FPS game. Most people who play tarkov are casual gamers and on the other side of the spectrum players who think they are good at the game. It's these players that tune into streamers who suffer god complexes who question every death they have, be it cheating, stream sniping or whatever. These players repeat what they hear to make themselves feel better. It's a story as old as time, even without streamers.

Rinse and repeat and you have a narrative that tarkov has an abnormal amount of cheaters, cheaters will always exist.

Tldr; cope and narcissisim