Well..Obsidian's origins are weird, and it's really hard to give them the legit credibility of 35,000 hours, although I will give them the benefit of the doubt. That's why they carry somewhat of a love-hate, villainous relationship.
Plus, let's be honest here, Duke doesn't exactly have the best record on iEra when it comes to being nice; https://www.graalians.com/forums/showthread.php?t=5544
https://www.graalians.com/forums/showthread.php?t=6225


Personally, I give Obsidian the credibility of being so powerful for such a long time, but their hours aren't exactly the daunting part. The crypt wins and the GST wins are really the part that stands out, otherwise, I don't really know what else you could give them.

I believe the term 'Anti-Graal' was also banned in-game because of GETS, correct me if I'm wrong.