This sound comes from the horror co-op game Phasmophobia, where audio cues are a big part of player tension and survival. The heartbeat effect became familiar through gameplay videos, livestreams, and short horror edits shared online after the game's breakout popularity in 2020. Creators keep using it because the cue is immediately readable even out of context: a rising sense of fear, danger nearby, and not enough time to react. It fits gaming montages especially well alongside sounds like a FNAF Jumpscare Scream or a danger alarm sound effect meme.