Computers can be simple tools for reading and study, if you want them to be, and make deliberate choices to that end.
The last few months I've spent a lot of time consciously re-engineering my screen time into what I want it to be and do, not what is easiest or most convenient. Getting off of most mainstream social media has helped tremendously, as it's truly insidious how engineered it is to seem like the most important, engaging thing in the world.
I'm doing much better now that I'm not exposed to strangers screaming about nonsense for a few hours each day.