So your account id and realm is available as a watermark in the screen shots, what nefarious problem does that cause? (I can imagine it helps identify griefers and people who cheat and brag)
The people under NDAs, hackers, and griefers are going to know about this now and just turn them off. Which means the only people negatively impacted by it are the innocents.
My understanding (and it may be incorrect) that the character name and realm is embedded not the battlenet account id. so something Blizzard could turn into an identity but 'regular' users could not.
Combine money and time and intense interest and huge number of users gives you the situation where people will find exploits.
People in real life have (very rarely) been murdered over video game items. It's probably a good idea to make sure any hidden information is carefully encrypted.