It's easy to be a MOND enthusiast without a physics PhD, it's a lot harder to be an axion or WIMP enthusiast.
"Just tweak the laws of physics, bozos!" is a really easy idea for laymen to latch on to, which is why you see so much interest in it among science enthusiasts.
"The experts are wrong because they are overcomplicating things" is also just a rhetorical trick that has pretty much always worked on some segment of the population.
"Just tweak the laws of physics, bozos!" is a really easy idea for laymen to latch on to, which is why you see so much interest in it among science enthusiasts.