I dont think you would need someone to publish that your hair was on fire on the web before you would believe it.
The wasteful part is that repeating the behavior (addiction or not) can become self-repeating even in the absence of the fix. Also one has to realize that at least in the case of news there is very little every day and most of what is distributed is rehash, or ancillary, or bloated and repeated to sell ads. You can go without watching or consuming news on the internet and not miss much for a pretty long time.
As far as tech goes, it moves very slow you can take a couple years off a software eng job and come back and not much has changed with very few exceptions. (Yes LLMs were one)
When you are done staring at your phone/computer at the end of the day reflect on whether or not you got anything really worthwhile out of it and put it in perspective. The signal vs noise ratio is not in your favor and getting less so every day.
I personally stare at my phone alot for the same reason as many people do. Im bored. But I dont do it at the expense of anything else Id rather do.