This is a hard lesson and tough pill to swallow but we'll have to chuck it down as part of the growing pains. Even if they're blacklisted or whatnot, there's still no way to get back what they stole because the damage is in perpetuity.
Taking action against the said players will actually hurt investor confidence further and so, I understand why the project went down the route of peace.
Sets a terrible precedent. They should have been squeezed till they gave back every last GLUSD.