Why it worked
The video leverages the popularity of Roblox and the desire for in-game currency (Robux) to promote a utility app. The simulated acquisition process creates intrigue and a soft sell, while the clear call to action directs users to download the app.
Summary
The video demonstrates a Roblox avatar customization interface and then transitions to a simulated process of obtaining Robux using an app called 'RBX Counter Get Rbux Calc'. The app appears to be a utility for calculating or obtaining in-game currency for Roblox, with a call to action to download it from Google Play.