I am not only talking about the violations that are in the forum rules. Some other things are not listed on the forum rules but these are frowned upon. There is a thing called ethics and we all should be ethical. Let's talk about how our locals react when they see someone violating forum rules. Let's say a newbie just registered and wrote something that violates the forum rules. Usually, we don't report that post. We try to correct them instead because I believe not everyone reads the forum rules before they register here. But if they continue doing it by ignoring our messages, we report them.
Some other things are not listed on the forum rules such as merit abuse. Cheating with multiple alts and many more. Sometimes it's obvious that a account is alt account and who control that. But we cannot report without any kind of evidence. But, when something is going on for a long time and a big number of users joins that, we should do something even if we do not have any proof. I did what I wanted and luckily it worked.
Newbies in the examples you have described definitely deserves to be guided. But I was talking about deliberate plagiarism or using AI to "write" posts. When someone does this, it means that he is aware of what he is doing. Does he need any guidance or advice? Will it be a discovery for him if other forum members warn him that this is unacceptable? I doubt all of that. That is why I see more use in just reporting such users to moderator. But of course I am not talking here about some users making mistakes, but who are ready to learn and are thankful to the guides which over users provide to them.