But, why? A lot of them do that.
I figured it was because the front camera has better resolution but that’s just a guess.
I do know that some people intentionally mirror videos in an attempt to avoid copyright infringement since they won’t be detected by the automated software used to detect such. Unless they look for mirrored videos, of course ;-)
Not the case in this one at any rate.
My guess would be, so it’s like a monitor, they can see what they look like, backwards. But then that’s what we get to see too. Selfie culture.