@tio
AFAIK, the mass of a black hole is concentrated on a point called the singularity, this is the reason for its extreme gravitational pull. So for black holes to behave the way it does, it needs a singularity. Are you suggesting that this singularity is made of dark matter ?
How does this dark matter singularity become that foggy patches shown in the NASA Hubble map ? To me, this doesn't seem to solve dark matter but just complicates things even more, lol