Dark side of the moon would be a nifty place for a telescope.
There is no permanent dark side of the moon. There is a near side we can see and a far side we can’t, but any point gets two weeks of sun and two weeks of darkness.
It really doesn’t have any advantage two weeks of sunlight for each side and out of radio contact with the Earth always, unless they have a geo lunar satellite deployed to relay coms.
Especially a radio telescope, with the moon blocking Earth sourced radio signals.
Radio telescope, sure.
Optical telescope? Sunlight, gravity, dust, and infrastructure needs makes a pure space-based system better.