Maybe the default Pamac setting could be changed to "once a day’, it is “every 6 hours” by default.
Maybe a specific AUR check setting could be added?
Maybe the default search should also be only in the repositories, instead of searching the AUR by default (clicking the AUR button would then trigger the search)?
I like the idea to try to responsibilize people, but let be real, most users would not even read it, let alone follow the guidelines. If measure were added directly in the application that would have a real impact.
//EDIT: I looked in Pamac console output, looks like the culprit is Pamac itself, flooding the AUR when auto suggesting things Add/remove software AUR problem - #22 by omano