Meanwhile, keeping a kid off a screen and giving them other activities is expensive, in parental time if not direct cost.
I don't know if it's education directly, or income, or anything else because those are all correlation. If I had to guess, and this is a guess, is that the deciding factor is whether parents have decided their kids are simply a cost (something to be fed, entertained, educated, etc) or an investment. When a kid always wants your attention, and you view them simply as a consumer, it's easy to just hand them a digital device and ask them to get lost. It's much more work to sit down with them and play a game or read together.
Some 30 years ago, in my country the parent instructions to their kid, for the afternoon, would be: "go outside, play with other kids, I don't want to see you inside before supper".
And all was well. Sort of.
If they get addicted, az least it could make them smarter
You can get basically disposable tablets at Walmart for ~$50.
It's just like golden eye, but now you've got to pay to play as odjob.
Studies disagree. Too much screen time isn't great for kid development. At best, we're not sure what sort of effect it has on kids.
Part of the reason is that showing a child a TV screen isn't the same as injecting heroin directly into their brainstem; the effects aren't super drastic, and researchers are reluctant to come out and say that X absolutely causes Y, when there's only some correlation, and it's not obvious.
We _know_ that eating a bunch of cyanide will kill you. We don't know exactly what sort of effects watching TV will have on you, because it's not quite so directly causative.
Anyway, we do know and suspect a lot of stuff:
https://www.npr.org/sections/ed/2014/08/28/343735856/kids-an...
https://www.psychologytoday.com/us/blog/behind-online-behavi...
https://www.forbes.com/sites/alicegwalton/2018/04/16/how-too...