It does work, it's just complicated to setup.
In that picture, I'm using KDE applications that are flatpaks for Cosmic Desktop on PopOS with a Kvantum theme. I made a longer post here when I was searching for instructions for how to complete this recently.
After my experience, I don't really know what the best solution is for setting it up. I guess it would be nice if the major platform applications for like KDE were supported for dark mode by default on the DE. I don't know, it really bothered me though.
Just make a link post in the community. Don’t worry about the length, all that matters is if people like the content. There have been people who posted to /r/rust about starting sales for a book they just published that did really well with votes, so pay isn’t always related.
There’s lots of blog posts in /c/rust and /c/programming. Some of the blog posts in /c/rust can be really long. There was one today about async rust. There are also sometimes free book link posts.
Treating people like you want to be treated can be a decent way to evaluate yourself. Just make sure it’s relevant to the community. If there was a mistake, don’t worry about it, stuff is removed all the time in other communities and subs on other websites, and you didn’t do anything wrong.