> Well, I think it's the combination of the apps as you described with the devices to connect to them always being within arms reach.
I wholly agree.
As for the personal experience, I am only 21 so I left high school (in europe) around 3 years ago. TikTok started to boom around 4 years ago. What I've noticed is that my peers who are just a few years younger than me use these apps much more. To the point where it's just unbearable to watch a movie with them because they open their phone up every minute just to get fed some random content. My sister who is 4 years younger than me is insecure to the point of having developed an eating disorder, and I know that social media played a big part in that. Both the insecurity and specifically the pressure to eat healthy.
The algorithms in these apps really play into your faults. If you engage with videos about healthy eating because you are insecure about your weight you will only get fed more of the same. And the creators on these platforms can make extremely toxic and harmful content.
I myself have tried to get TikTok to only feed me conspiracy theories and managed to do it in minutes. Some of my friends have succeeded in getting it to show self-harm content in a few minutes as well. I really find these platforms that give you absolutely no control over the content you're fed dangerous.
> the situation seems not much better for older people
I personally don't know many older people that really consume much phone content. My parents sure don't, neither does my older sister or my colleagues. For the most part anyway. So at least in my social circles the situation does seem better.
I even know a lot of people of my age that actively try to fight it. For instance by disabling video suggestions on YouTube.