[prerok]

The problem I have with dark matter is the name. If I understand it correctly, its existence cannot be predicted. We observe strange results, so we explain it by inventing some strange new concept of mass that's otherwise non interactive.

For example, the dark matter might be mass gathering of otherwise non reactionary particles like neutrons, it could be wrinkles in spacetime that have a similar effect as massive normal matter bodies have, or they could be advanced civilizations that learned how to hide their star systems from the rest of the universe.

We simply don't know. I suppose we had to name it somehow, but the name just sounds wrong. It might not be matter at all. It is also not dark, it's non-reactive.

Why did they not rather choose something like spacetime wrinkles?

[Nevermark]

We know we can't see it (dark, as in not emitting or otherwise interacting with light), and it creates and responds to gravity in the exact same way the matter particles we know do (matter).

The two word choices can be quibbled with, but they form an accurate shorthand for what we know.

If the fine structure is discovered to be wrinkles in space I expect there will be a renaming during a time of great celebration by the future Nobel Prize winners! Especially if that also shone light on space-time's ultimate structure!

Edit: I will humbly propose a name for your postulated tiny space wrinkles: Wrinky-dinks!