Could be, but I know other PvP-server guilds. I have a friend in Pandemonium, for instance. The striking part to me though is just how much I see of them and their pewp on the Blizzard boards. I didn't read Safehouse or the other prolific trans-server EQ sites, but I at least knew who Afterlife was, Legacy of Steel, etc. It's highly likely I wouldn't know about FoH if I didn't also know who Furor was, though. I had contact with a couple people on the lead guild on ARo, and they were one of the elite guilds across all servers, but I otherwise hadn't heard of them. If DIE was worth anything at all in EQ, with the kind of noise they create, I would have heard of them.
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Only the exceptions can be exceptional.