Splitting your Tiktok content into two

Hello Fam, I know you guys will have seen some videos on TikTok with two editings that go like this, One part is the main content, the second part is like cutting fruit or Playing a small game, My question is that I noticed Tiktok regard this as a new content despite that the content is posted before by a TikTok member because the screen is split into two one for the main content and the other for the non-content which probably just like a game,

Questions;- Where do these guys get some of the non-content they use ?

Look at this TikTok user, He is doing this exact thing to all of his videos and getting good views @Savannah_8641 (Forgive me if this is your channel , ) want to learn at thy foot

Satisfying vidoes on youtube.