Asked support if its a bug and got answer so its a feature:
You can share your account with two more people who will play each on different realm. They will not have access to rmah and u wont play together but other than that its Diii.
As long as you three dont want to play together or share loot or commmunicate somehow its truely okay.
I have unlocked mah wife from cellar and figured so she is not interested in rmah nor party so its perfect for her to just solo Diii on americas while i plays on europe (yet i do not as servers went down)