Why it worked
The video uses a relatable "POV" format and a common fear among people who work on computers (spilling a drink on their device). The humor comes from the exaggeration of the laptop being a "source of income" and the careful removal of the drink, which resonates with the target audience of developers.
Summary
The video shows a person typing on a laptop with a drink placed precariously close to it. The on-screen text humorously suggests that the drink is too close to their source of income, implying the laptop is their livelihood. The person then carefully moves the drink away.