Ethical average is not what matters.
I am no lawyer, but I doubt that an exchange will reveal the identity of a user who deposited funds (or take any action against him/her), of which someone says, he/she doesn’t legally own.
You (but who is “you”?) had to prove that this user is in control of those funds without rightfully owning them.
That can be hard.
Why after all did Nu grant the NBT if not on purpose?
Oh, by mistake? You make someone a gift and want it back?
It’s a slippery slope that reminds me if thoughts about “coloring” BTC that were involved in criminal activities.
Tokens need to remain neutral.
Who will voice that accusation?
Nu is not existing in any legal space. That’s how it was designed to be (hopefully!) immune against governmental attacks.
Nu could hire a lawyer, but based on what law would a law suit be started?
I fear this money is gone.
We might have learned the hard way what we’ve been proud of before:
existing NBT are beyond control of single entities and can be transferred without limits.
That is even true for the entity Nu itself.
Nu can create NBT, but not destroy random NBT at will.
It’s good that it’s like it is.