This was a map of the Death Realm, showing the exit path - which is not allowed. If you want to make exit paths maps in the game once the cartography is fully working, be my guest. However, by sharing screenshots of them on the forums, you will be eliminating any need for any cartography skill at all. If you can see a map on the forums, why go through the trouble of interacting with other characters to get your hands on an actual map, or get one from an NPC quest, etc.?
We have never said that any maps, of any kind, are not allowed here. In the Fan Art section, in fact, we encourage maps - done artistically, and with no intention of sharing spoiler material such as trainer or mining locations. So if someone does a beautiful rendition of Hydlaa as if drawn by their character, they're free to make it public.
Now if the idea that you cannot know where all the trainers or mines are immediately annoys you, ask yourself why you are playing the game at all - is it to know everything immediately and breeze through all challenges? If so, save yourself the trouble now and find yourself another hobby.