I've pondered the same thing. And on top of it all, YT videos use lossy compression. Yet some still insist the videos allow them to "hear differences" and that they can make judgments based on that. It makes no sense to me.
Why on earth?
Answer me this: On You-Tube, there are endless of reviews, comparisons, and demos of equipment played in the creators room, recorded by a mic and published as if we could hear anything relevant considering we are listening to OUR stereo! Some of these have high play counts. Does anyone think they could hear differences in an amp or DAC picked up by some unknown mic, A2D, post processing and played back on their HT? Are we really that stupid?