Gotcha...
Slip mining is mining on the edge of a ring, using the gravity lock of another ring. Google it. It is considered an exploit by some, since it uses a "bug" in the game mechanics. All the rocks you'll find there have cores, but the ones you don't see come at you at the speed of light, and they WILL kill you. It's not more prosperous than normal core mining, but it's kind of a thrill, and it shows you parts of the game that you normally wouldn't see. So being curious by nature, I couldn't help myself. I read the rules of the game, and decided this was a "grey area". Normally I avoid those IRL, but as I stated: It's a game.
I don't think slip mining will become a thing. It's way too complicated and dangerous, and there's no real gain. Therefore I personally also consider it a non-problem for FDev. But it has scared me in a way the game haven't been able to otherwise. At one time I was hit by a rock, and died instantly, while hearing something that sounded like a high pitched scream from my ship wiggling in agony.