The problem is not access, it's unlimited instant access. We had to wait until our parents weren't home to raid Dad's stash. Or catch a tape from someone's uncle at a sleepover. It's a world of difference.
That being said, blocking is not the answer. Blocking the major sites just pushes people to smaller sites, which may be more likely to harbor revenge porn, underage content, nonconsensual content, etc.
Is it normal for housecats to spend time outside? I have two. One is fully indoors, the other goes out 2-3 times per week, for maybe a half hour, and doesn't venture past our back patio. No hunting that I'm aware of, and definitely no pooping in the neighbor's garden.
Since you mentioned ssh and vi(m), I'll throw out vimwiki. No Android app, unless you count termux, and there's a bit of a learning curve, but idk, it really clicks with me.
Obviously we're different people, but my silver bullet was 300mg Wellbutrin. (150mg did nothing.)
I have ADHD that doesn't respond to stimulants, so my doc tried Wellbutrin. Didn't touch my ADHD, unfortunately, but I haven't had a violent outburst in years. Last night, I dropped a piece of lasagna on the kitchen floor and reacted with a "goddammit," instead of the tantrums I've had in the past. So much nicer.
I can't play a bare Switch for more than 15-20 minutes without pain, but with a Satisfye asymmetric grip, I can play for hours. Not a shill, just a huge fan of the product. :)