https://www.theguardian.com/technology/article/2024/jun/04/internet-addiction-alters-brain-chemistry-in-young-people-study-finds I'm sceptical of this. Whenever someone makes a claim like this, it is usually debunked by someone else or another study.
It wouldn't be the first time that "the kids these days" is accompanied by someone trying to pathologize their behaviors.