This is only meaningful if enough people read it and agree
Nah they are pretty good a banning users that don't follow the guidelines.
When creating an account, there should be a short screen with the salient points from the guidelines to follow.
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That’s true. Fortunately, by virtue of it being added to the guidelines, quite a few folks here are prepared to reply to obviously generated comments by simply citing and linking the rule. Just search for “shallow dismissal” to see many examples.
It will take time, but eventually everyone will know about it.