I've seen that before too. Not that particular instance. It was an ad I saw for a site that you can buy D2 items for money (I was on a site for D2 mods, if you must know), that used a modified version of the GW1 warrior (from the cover).
I think I saw the same ad, a few years back (I was searching for a good screen shot for an example of that Diablo font). I let the ANet support know of it, and I think they may have taken action as I don't see that ad around anymore.