Shared on user generated soundboards under the name Meme Team Sub Thanks, this clip comes from the small thank you stingers creators play for new subscribers. It spread through meme edits and stream alert packs where a sincere thanks is treated as a joke in itself. The autism tag in its original listing reflects the self deprecating, ironic humor common in those communities. It remains in use because the long, sincere sounding delivery works for both real gratitude and mock celebration of very minor moments.