I think its not just kids anymore, it’s adults too. Everyone is glued to their screens these days. But kids are more vulnerable to influences from “social” media and don’t have any defences to the psychological warfare going on. Of course they feel like shit.
I kind of agree. That’s why I don’t let my kids buy stuff like that. My kid said he wanted to buy a phone, and when I told him it would be subject to our same computer policy (<2hrs/day, they earn time by reading, etc), he suddenly wasn’t as interested.
But yes, if you create a bunch of new rules after they buy something, you’re a dick. Let them know what the rules will be before they save up for it.