What if the new author of the pinned thread received a negative feedback for some reason ^{since DT are regularly changing so reds wil be visible}, so another author/thread will be chosen to be pinned, so on and so forth, there's no end to that.

Permanent solution could be an admin/mods made account that is only for this kind of topics ^{(pinned topic)}. This thread can be edited by mods as well so it will be easy to edit it when it becomes outdated.