A Dark Lord might lack a certain prestige, but a Demon King still held at least a little bit of it.
Now, Dumbledore had stated that he intended to act as a Demon King with even more prestige than the Dark Lord, and Ye Feng made it clear that he was not going to take the blame for this.
Of course, although Dumbledore had said that, he only said it in front of Grindelwald and did not directly announce it to the entire wizarding world.
Chapter 341