That video is um, sad alright.
On trains and buses nearly everyone is on their phone. Public transport. When I was younger and on the buses I would see nearly everyone reading an afternoon paper. Even on the Sydney Harbour ferries, surrounded by gorgeous views, arguably the best in any city anywhere, people would read the papers.
The other month a photographer's project got attention. He uses photoshop to remove the phones. It is similar to scenes in the video you linked, and just as revealing.
https://www.removed.social/united-statesSo many young people spending hours on games. 40 hrs a week, mostly into the early hours? We had pinball games or Pacman, but only until the pocket money ran out. Then you mowed another lawn or cleaned a pool for more money.
As for depression or social alienation, many people are lonely, and for many reasons. I have worked in this field as did my father. Dad was involved in the methadone rollout for years then got a job with Qld Health counselling for those with Alcoholism. Interesting that working with hard drug addicts was a skill requisate for dealing with alcohol dependency -which is much more widespread (even in politics, boardrooms and stock market) and perhaps harder to kick because it is sold absolutely everywhere, even supermarkets, corner shops and fruit/veg outlets in the ACT.