In the sense that a gravitational field causes a curvature of spacetime and by removing the gravitational field the curvature is returned to zero, spacetime is elastic. My post however wasn't about spacetime being elastic but about it becoming plastic beyond some gravitational field strength and not returning to zero curvature when the gravitational field is removed.
I was suggesting that perhaps the reason the curvature hasn't returned to zero is because the gravitational field hasn't been removed i.e. the matter is still at the event horizon.
Indeed! According to wiki; "a black hole has only three independent physical properties: mass, charge, and angular momentum."
Interesting to me is "a charged black hole repels other like charges just like any other charged object, despite the fact that photons, the particles responsible for electric and magnetic forces, cannot escape from the interior region. The reason is Gauss's law, the total electric flux going out of a big sphere always stays the same, and measures the total charge inside the sphere. When charge falls into a black hole, electric field lines still remain, poking out of the horizon, and these field lines conserve the total charge of all the infalling matter. The electric field lines eventually spread out evenly over the surface of the black hole, forming a uniform field-line density on the surface. The black hole acts in this regard like a classical conducting sphere with a definite resistivity."
Am I understanding this correctly? It's a big magnet?