In my experience as a moderator of several subs, Reddit actively blocks zerohedge links, they'll appear in our moderator queues and even if you manually approve

In my experience as a moderator of several subs, Reddit actively blocks zerohedge links, they'll appear in our moderator queues and even if you manually approve them they just sit there in the queue, the only option that works is to remove them or mark them as spam. They do some others too but zerohedge is the one I see every few days in /r/silverbugs and /r/prepperintel, and the only one I can remember by name.