Anther problem is that users tend to not read anything, including the rules, and they will probably not read that single topic either.
Exactly this. If they don't read the rules and get banned because of it, they aren't going to read a topic about why they got banned. Furthermore, the majority of users getting banned are fully aware they are spamming plagiarizers, but they create a topic anyway just to "try their luck" as it were.
I think a better solution would be to create a ban appeal sub-board in Meta where we could move all these repetitive topics, so as to clean Meta up a bit.