As an outside observer the mystery of dark matter is interesting, but I can agree that the theories are not always so fun. My entirely uneducates idea is that

As an outside observer the mystery of dark matter is interesting, but I can agree that the theories are not always so fun. My entirely uneducates idea is that dark matter probably is some by-product of what's going on in that place of the universe we know nothing about: inside black holes--maybe spacetime curvature can only be so deep and hits a floor, spreading out in a halo around galaxies? This would be consistent with dark matter hanging out around galaxies, but not interstellar dust clouds, and also being proportional to the size of the galaxies, which is proportional to their central supermassive blackholes. Anyways this is just a wildly uneducated "arm-chair" hypothesis, but it just possibly seems when comparing this to some of the wild theoties out there, that it would be more likely a product of a known-unknown (interior of black holes), and not an unknown-unknown (new particles, new laws of physics). In that sense, if it's not ruled out already (it probably is, someone else must have thought of it), it's less crazy than modified gravity apparently was.