But after researching it a bit, I found out that even before 1992, when this Mongolia mining business got started, people were doing what is referred to as "ninja mining."
Today, if you claim a cryptocurrency has been ninja mined, you're claiming something surreptitious happened with the introduction. Like, it was mined by a few people in secret. Or it was mined in public, but nobody knew all of the details prima facie, and if they had, more people would have gotten involved.
But it turns out, ninja mining actually predates cryptocurrency.