This sound comes from Fallout 3, the 2008 role-playing game by Bethesda Game Studios. The level-up cue became memorable because players hear it repeatedly during progression, linking it strongly with reward and advancement. Online, it spread into gaming edits, Twitch highlights and short memes as a quick audio shorthand for improvement. It still gets used because the meaning is instantly clear even to casual viewers: something just got better, stronger or more successful, much like a correct ding in non-game edits.