No, the definition was always about the state of the person doing the scrolling, not of the content. For some reason it them changed, and now it appears to be coming back to the original meaning
Most sources, but not all! To me, watching 8 hours of puppies, kittens and rainbows in a day would have a pretty negative impact on my life. That kind of content is negative when it becomes excessive. Heroin feels really good when you use it too. Doesn't make it a positive thing.