Short farewell clips like this one spread through soundboards and short form video because they solve a common editing problem, how to end a clip cleanly without recording your own outro. Creators reuse the and goodbye line as a shared sign off, especially in reaction edits, gaming highlights and comedy skits where an abrupt exit is part of the joke. Its popularity comes from its flexibility, it can sound sincere, sarcastic or dramatic depending on the scene before it, which keeps it useful across many different styles of content online today.