So big that despite it being ridiculously far away, we get a better image of it than the much smaller black hole in the centre of the Milky Way, our own galaxy.

Black holes are crazy. All the entropy of a black hole is, apparently, on the event horizon. But if things keep falling closer to the singularity, then that means the entirity of the black hole is described by information at the surface. That has holographic implications for the nature of the universe. It could mean that everything we know is an inward projection from the 2D surface of the edge of the universe... the information that describes the universe is infinitely far away.

Or maybe there isn't anything beyond an event horizon, maybe black holes are essentially hollow. The event horizon is the black hole. That's no more ridiculous than all the matter occupying a singularity. Why not a singularity for every base unit of energy, forming a sphere with a surface area determined by its total energy value?