I don't get it myself, but for whatever reason a lot of people do enjoy this. I'm guessing as a coping mechanism. Probably in the same vein as reading books/news, or playing video games etc.

I have an old friend who every night picks out some criterion collection DVD to watch, and posts about it on social media before/during/after.

That said, I have a tablet I use for long-form reading/youtube (90%+ reading) during train/ferry rides > 10 min, but obviously haven't had to use it much recently. Mostly reading.