Product placement
Clip Studio Paint: ACTS - it is the software used to create the animation, and the creator states it is their first time using it, implying they are operating its interface to generate the animation. Removing it would mean the creator could not have made the animation as shown. Brushbuddy: ACTS - it is the subject of the animation, and the creator's cursor pack is linked for purchase. Removing it would mean the animation has no clear subject or purpose.