It's like anything in life. .
The internet can be used for some awesome things. But, when you stare at your screen all day and watch Netflix/YT/IG videos for hours on end you might have an issue. There are studies that show excessive screen time leads to small levels of depression in most people. Maybe it's why we are noticing anxiety, and depression in more young people today than ever before. Comparing your life to a fake IG influencers life can be pretty depressing. A young 20 something might not know the difference.
I am not convinced by that. You could certainly watch the equivalent of netflix for 'hours on end' long before the internet was commonplace. There were things called televisions and video tapes and DVDs. Indeed if no-one ever watched 'for hours on end' the movie industry would be in trouble (admittedly I find I now lack the concentration span to watch an entire move in one sitting - maybe the internet is to blame for that, or maybe its that most movies are actually pretty boring?*)
And are you sure about those studies? That it's not the usual 'correlation doesn't prove causation' thing?
The growth of a culture of comparison, and of increasing "image-management", does seem like a real thing though. But isn't that just a continuation of what has been happening ever since the advent of mass media? Once upon a time we'd only be able to compare ourselves to the other people in our tribe or village, then we started seeing images and hearing about the doings of exceptional or outlier people all over the globe. I would have thought the internet has just continued that development, continuing to confuse our ideas about what is 'normal' and change the standards by which we judge ourselves.
* Case in point - watched 'Casino' not long ago - God almighty, three long hours in the company of characters with not a single redeeming or interesting characteristic among them, and with a plot that was utterly generic and predictable. That film is so dull. Had to keep going off and doing something else for a bit. Such a contrast from the thrash-punk-take-on-gangster-movies that was Goodfellas. It was like the self-indulgent, uncessarily-extended, boring prog-rock version of that movie.