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It’s probably because the “create a Reddit post” form doesn’t require you to even visit the subreddit you are posting to. It DOES show you the rules/sidebar of the subreddit you are about to post to (for /r/rust it includes a link to /r/playrust for the gamers) but apparently many aren’t seeing that.

"Banner blindness" applies to the rules/sidebar. The user sees it, notices it's not what they're looking to interact with, and ignores it. The same thing happens for modal dialogues where the user will click whatever button makes the message go away without bothering to read the message, only the button text.

It is hard to perceive that which you are not aware exists even with obvious evidence in your face

That's not a great explanation when there's, you know, rust the material.

You are an average person. A program you're using crashes.

The only non-generic word you see in the crash message is "SQLite".

You look it up, find SQLite, and you bother the developers for help.

The problem is as old as labels.