Regelegorila wrote:
It's not a bannable offense by any means is it ?
No, not bannable at all. This is just doing the same thing many displays and HDTVs have built in with various aspect ratio / fullscreen / zoom / fill modes, but on the video card side of things. Nothing nefarious.
You can get similar results by running the game in a standard 16:9 resolution, and using your monitor's OSD to stretch the image to fill the screen if it has support for that sort of thing. Poke around and see.
Now if you were to hex edit the .exe or use a hack for proper 21:9 support, that would probably be bannable. Stretching the picture is totally legit (and not desirable).