Yes, I know, however it's still tinkering around gravity but in a roundabout way. Add some anomalous mass in order to explain why things appear to be awry with theory. Not so much as playing around with gravity itself but adding bits on in order to have some sort of explanation to account for its observed effects.
A fudge factor is still a fudge factor no matter how you dress it or what you call it
Who knows...what if it's a combination of both dark matter and MOND?? Unlikely, but we really don't know, do we