[TheCapeGreek]

Or automated transcription.

For YT vids, especially shorts, it's because churning out shorts/reels/tiktoks of clips from longer form videos (and/or with the split screen gameplay of some mobile game/minecraft platforming run) is now a common tactic for trying to gain tons of views on your account for monetisation later.

[Tijdreiziger]

I’ve also frequently seen it on long-form videos. I think the transcriptions must be at least partially reviewed by humans, because YouTube already has automatic transcription for videos without subtitles.