In any field, if charged, evidence is provided.
This is a discussion forum, not a court of law. No one here, including the mods, is obligated to do anything for you. If you're wondering about all the negative responses, it's because this situation has become so common that it's a waste of time for people to go digging for examples of plagiarism--usually it's not even the mods who do that, it's regular members and they do it on their own time.
Here's a great example of why an example of the ban offense should be provided in the ban PM. Can it really be so hard to implement something like that? Obviously the banning process is initiated with someone finding an incident of plagiarism, so can't this forum come up with a way to include a quote of the plagiarism? This would obviate pestering plagiarists creating threads like this guy--and that's assuming he did indeed get banned for copy/pasting.