While I agree in principle for healthy people, it's a waste of time, but for people for whom light entertainment is their medicine... would you rather they be drinking?
This comes up a lot re: video game addiction.
The jury's still out on the impact of social media and light entertainment (i.e. YouTube) on mental health. UK teens for example are doing far fewer drugs, getting pregnant from unsafe sex much less often, rising in school rankings, despite less sleep and higher levels of reported anxiety from watching more YouTube and Instagram.
"Everything in moderation" is kind of reductionist, of course we'd prefer that an asinine activity whose harm must be marginally declining the more people use it, not less, for the average person, substitute a harmful one like, I don't know, smoking meth. That's definitely happening for some people.