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Probably to evade some software determining it's stolen/unlicensed copyrighted content and DMCA-ing/removing it (e.g. YouTube's Content ID system)?
That's exactly what it's for. Some of them have background music on them, to get it misclassified. Some also put a random face at the bottom with the same phrases every now and then to get it classified as a reaction video. I've also seen black lines in the middle of the screen. Sometimes the clip jumps forwards and backwards to make it harder to detect.
I think the subway surfer thing was also originally intended for that, before it was found that it somehow also increases attention. The split between the videos also makes it harder to identify what it is, so maybe it'll get classified as a minecraft clip instead of copyrighted movie.
People go to insane length to post full movies and shows on YT Shorts/TikTok/Instagram. It's like early YouTube again where you'd watch and episode over 50 parts.
God I miss being able to find whole movies split into chunks that someone uploaded. It's how I first watched Tenacious D and The Pick of Destiny.
Until you find that part 42/53 was deleted