Lots of people listen to the audio. It’s like a podcast, or having the radio on, which is fine in lots and lots of jobs.

Some people probably also literally watch it, but I know multiple people who basically use it as a radio at work.

Plus, never worked anywhere where half of everyone, including management, is more-or-less openly watching sports more than working during major tournaments?

Working in infrastructure design (specifically railways), cab ride videos are often useful to fill in gaps in as-built plans or the pictures you took on a site visit (you'll always miss out to photograph something that'll be of major interest later), especially in early planning phases. Plus there's the odd software tutorial video here and there, too, of course.

I think it would give me a life crisis and I'd feel like a failure of a boss if I learned my otherwise productive employees felt they couldn't watch sloptube the clock. A sysadmin that isn't constantly jacked into nethack is hardly a sysadmin at all. You should really demand more humane working conditions if you feel like you have to micro-optimize your work day.

In small shops youtube is quite a handy source of information. I have to prototype and 3D print lots of stuff.