IMHO, MOND is speculative theory. Any theory should define law(equation, formula) of based on some model which explains why exactly such law physical value dependency was used. Does MOND do it? I'm not sure.
As I understand the philosophy of nature, we have to change the main paradigm of free(aka inertial) motion to understand DM phenomenon.
Any motion at any time isn't free (i.e. non enforced). Only forces support the motion. The motion by inertia is illusion that such motion is free (non enforced). Only the body, keeping in rest, forces do not act to.
As I have found, the gravity is a force which dynamically increasing during the motion. And such force makes any body or particle to accelerate its moving, if they are do not undergo for action of other forces. Thus, all bodies in the Universe have been accelerated, including stars. That's why their velocities do not decrease while they moving around the galaxy centre. The evolution of galaxy can be represented as stars moving around its center and slowly retires from it due to acceleration of [pseudo free] inertial motion. Such motion, actually, is provided by gravity of othe galaxies in the Universe. Rough calculation defines acceleration of any [free] motion equal to approximatelly 1E-9 m/s². DM doesn't hold the stars, as blocked inside the galaxy, on the stable orbit. That's why we observe various types of galaxies. Highly likely, galaxy evolution goes through various stages from quasars to scattered galaxies.