To be clear - it’s not just the help category, it’s “post voting” anywhere in the forum, which is turned on by default in the help category, but can be turned on anywhere. There’s nothing on “post voting” in https://community.openstreetmap.org/t/how-to-use-this-forum-for-new-users/314 or the usually more useful https://community.openstreetmap.org/t/osm-forum-auf-discourse-tipps-und-tricks-fur-neue-user/3264 yet.