Incorrect, I'd write a server-like program to intercept all battle.net packets and specifically block certain packets such as 0x15.
edit: or wait, ya, it'd block access to the browser because the ad wouldn't ever show up.
Steam Wrote: 4:02 PM - George, of the jungle: was out
4:02 PM - George, of the jungle: bison, dude
4:02 PM - Brawl Bashin’ Bison: ???
4:02 PM - George, of the jungle: you're very rude towards alina
4:02 PM - George, of the jungle: how about unbanning her friend?
4:02 PM - George, of the jungle: I mean
4:02 PM - George, of the jungle: it's only gamebanana skins
4:02 PM - Brawl Bashin’ Bison: LOL
4:02 PM - George, of the jungle: ^^
4:02 PM - Brawl Bashin’ Bison: LOLOL
4:02 PM - George, of the jungle: lol