Jesus, isn't it at least a bit obvious? OK so let's call it 'interactive screen time'. No, reading ebook doesn't count, as long as you don't keep switching to something else frequently. It will mess up your eyes worse than physical book, but that's about it.
I can see the proper cancer that screens cause to small children development. Heck, some parents are proud how 'digital' their kids are, like scrolling through social media videos is some hard earned skill only few posses. What I see is failed parenting, and I call it like that. Then you look at the mood swings of those kids, how they behave socially, what they eat etc. and its often a sad story. Then you look at parents glued to phones themselves, often overweight, living unhappy unfulfilled lives, and it starts making sense (broad generalization here of course, but I see it very often among peers & a bit younger).
Kids ain't adults for sure but screen time, if not done for actual work or learning, eats time we could be actually doing something with our life. Relaxing, sporting, socializing, learning new skills, making ourselves properly happy. That ain't happening in front of screen, any screen. The energy recharge and 'soul' regeneration that me and everybody else I know experience in nature and wilderness can't be achieved in any other way. Screen time also sets unrealistic expectations on how 'baseline' of normal daily life should be with its always-stimulated-neocortex as such, no wonder kids have attention issues with 'boring' stuff that regular life simply is.
I may be a luddite re this despite being software dev, but in this case happy to be one since I've figured my path to happy fulfilled life, and it sure as hell doesn't need more screen time, nor any made up justifications for some form of addiction to such.