Why it worked
The video likely performed well due to its aesthetic appeal, featuring cute cat designs and the satisfying action of drawing with the pens. The use of relevant hashtags like #stationary, #fidget, and #kawaii would have also contributed to its reach.
Product placement
Fidget Switch Gel Pen: ACTS - its interface is operated to write, and it is the subject of the video. Removing it would change what happens in the video. EpenGo: APPEARS - it is a brand name on the product packaging. Removing it would not change what happens in the video.