Why it worked
The video uses a combination of exciting visuals (fight club atmosphere, martial arts) and a clear, albeit informal, call to action in the caption and on-screen text. The mention of a 'startup' and the creator's surprise at distributing for it creates intrigue, while the shoutout to another creator and relevant hashtags likely boosted visibility.
Summary
The video shows a series of clips that appear to be from a fight club or similar event, with people in a ring and a crowd watching. The caption indicates that sign-ups for a fight club startup are available in the bio, and thanks a user named @verdakal.