It appears `Cha0s, erstwhile admin of pr0gramm, after transfering admin duties to `Gamb pursued different ventures. It seems he developed coinhive independantly of pr0gramm and it's team (I can't verify this, but why not). The product was tested on pr0gramm some time ago, where users would run the miner in exchange for premium account time. The coinhive site appeared after this(, as far as I remember without mention of pr0gramm or identifying the admin as `Chaos). I don't know of anything proven beyond that.

(Edit) See also: https://news.ycombinator.com/threads?id=pr0gramm pr0 "official statement" https://img.pr0gramm.com/2018/03/26/6300254f309e8f69.png

I should add that I am not affiliated with anyone here, just a user of that board.