HN has fault habdlers in place for accounts with karma going too far below zero. It was a hellban at -13 for my old account. I did keep writing for weeks before I noticed, the exercise of which was still rewarding in a way, and I still receive few answers now. Sometimes I suspect mods to the visibillity. I reinterpretted rangeban to mean banned beyond a certain range (as opposed to how it is commonly used: the ban of a whole range of possible identities).