I think it's a combination of peer pressure from friends, colleagues, even family, to share memes and crap online... but in a family unit, parents outsourcing actual parenting to these devices.
With regards to kids, my generation (40), were often criticised for doing this with the tv, but I think it was very different. Saturday morning cartoons were on for a few hours, and the rest of the time was the news, and stuff kids weren't interested in until about 3pm. This meant we were out with friends, playing games, reading... just doing 'something'.
Kids these days could quite happily stay on their phones all day, and parents are often happy to let them, or even join them.
No wonder highstreets, museums, and other cultural attractions, etc are all dying.