Because he’s a cheater that people only watch because he’s conventionally atttractive and that gives him a halo effect of being more “interesting”.

Dude just closet cheats on top of being decent at the base and the only reason he’s really gotten popular is because of his appearance and the fact that he’s not short and ugly or 400lbs and a neckbeard.

Since he’s a normal or even conventionally attractive looking guy, he has a way broader appeal to various audiences and because of this, he became one of if not the most popular Tarkov streamer, attracting a lot of people to the game that had never heard of or played it before.

Landmark is like most people that are given everything in life with little to no effort or actual work put in. He cheats for his skill and game awareness and gets popular through his appearance like most people on social media today.