Most parents treat tablets like fancy TV sets.
The resulting harm can not be understated.
Minecraft and Roblox are active, creative pursuits, and demand disciplined, logical thinking to achieve goals. Lincoln Logs and Erector Sets for the digital age.
TV demands precisely the opposite. Kids are psychologically rewarded for passive non-thinking. They feel the win when their screen hero beats the villain, even though all they did was just... sit there and consume.
The modern equivalents -- TikTok, YouTube, Netflix, basically any streaming video service -- crank that badness up to about 162, because at least the television programming of yore was finite. You could only watch cartoons and be bombarded with ads for maybe two hours at a time before something more boring and adult came on.
Moreover, parents also knew what their kids were watching, because the TV was in the living room. Nowadays, with personal digital devices, none of that holds.
My family treats smartphones the same way we treat guns: both are powerful and dangerous tools.
I could make a pretty strong case that an iPhone is more dangerous to a toddler than an AR-15.
At the same time, you can't hide your kids from the world and expect them to be able to deal with it. Parents must take responsibility and educate relentlessly. You might start with "don't touch, find an adult", but you're going to finish by teaching your kids to master their tools.