I only changed the message on autobans. ("Autoban" = lingo indicating a type of ban. They're usually not actually automatic.)

In most cases, the person's last PMs will be one or more "deleted post" PMs containing the messages that got them banned. If not, then the reason for their ban is more complicated, and certainly couldn't be automatically determined. Having moderators put a reason for every autoban is a waste of mods' time. Autobans are for obvious cases when appeals should only very rarely be accepted, which is why the appeal topics in Meta can be immediately rejected 99% of the time.

I have no respect for anyone who would even think of plagiarizing in the way that these people do. They don't belong here. Additional warnings will probably have nearly zero effect, and if it has any effect at all, it'll just turn fairly-easy-to-identify plagiarists into more ambiguous shitposters.