Reddit

I looked up their posts. They likely ran afoul of an anti-spam algorithm. They have an account that was inactive for four years, then it started posting articles only from that blog and almost entirely to /r/technology.

Edit: Their mod team is also relatively small (7 non-bot accounts) relative to the number of users (14 million). For reference, a subreddit I moderate has a quarter million users and 8 mods. That's 32 times the number of mods on a per user basis. So there is every chance that the modmail message has just not been handled yet.