My DS has moved from state primary to private secondary and there is a difference.
Parents are generally a lot more wary of technology and giving it to their children. The school also provides a lot of advice, talks etc on online safety. There were a good few who didn't have phones when they started in Y7 for example. This suited us as our DS got his phone late in Y6 and doesn't have any consoles.
Towards the end of primary he had very few friends to play out with as they were all indoors gaming, and there is still a divide between the online gamers and the non gamers.
My DS does play on his PC occasionally, but as a PP mentioned, we have a big garden, and the kids who agree to play out with DS -football, cycling, are those whose parents aren't keen on too much screen time.
Also, the earliest DS gets in is 5:15pm. With regards to extra activities, he does football and cubs. Everything else is provided by school.
They don't have tvs in their rooms.
He is glued to his phone sometimes and we have to actively spend time with both children to play board games, watch movies, cook. But we are lucky to have the time and know how to do this. It's not easy but worth the effort in my view.
We also include the kids in chores. Contributing to the household is a non negotiable.
Then there's not much time to play computer games.