Dark matter might not even exist

Newton's Second Law states that gravity is inversely proportional to the square of the distance, but the outer edges of galaxies rotate faster than expected. Scientists were so baffled that they haphazardly introduced the concept of dark matter.
However, there is a theory that when the distance becomes very large, gravity is not inversely proportional to the square of the distance, but simply inversely proportional to the distance itself.
If this is true, galactic rotation speeds can be explained without dark matter.
This is known as MOND (Modified Newtonian Dynamics), a theory suggesting that at extremely small acceleration values, there is a tendency to be inversely proportional to the distance, which allows for the explanation of galactic rotation speeds without dark matter.
This seems more plausible to me, as I can never quite wrap my head around dark matter no matter how much I think about it.