I agree with Namsnanny - it might seem logical to say " we shouldn't pussyfoot around the grandchildren". But at the end of the day they are not our children , they belong to their parents. And if the parents allow this, we're not in a position to lay down the law and stop the children from sticking to their devices.
My 10 yr old grandson is a Fortnite addict - I see him every morning and afternoon and he is either on his PC at home, or on his phone while in my car. He talks to other kids online , and I've no idea of what they are talking about.
I'm just glad when , on the odd occasion, he'll suddenly ask me what I think about something and we end up having a really good talk about space, or the weather, or who has the biggest army in the world, or whatever comes into his 10 year old brain. I'm just happy for those times.
We can't change the way our GC are being brought up - woe betide any grandparent who tries. If my parents had decided to go against my rules with the children I'd have been very upset - I'm never going to risk that as a grandmother.