I was a big board gamer in my younger years.
The most “vicious” and cut-throat game I ever played was “Noble House”, based on the novel of the same name by James Clavell, about the Tai-Pans of Hong Kong.
I doubt this thrones game can come anywhere close to that.
We play all sorts of games, I’m sure tons come close. Betrayal on house on the hill I think it is. rISK 2010, Arkham Horror, Eclipse, gosh there are so many.