I can't really say what you were banned for and I am not defending Blizzard. But browsing their code of conduct it may fall under "advertising" which is:
Quote:
Advertising
This category includes advertisement of:
Any non-beneficial, non-Blizzard related businesses, organizations, or websites
If a player is found to have participated in such actions, he/she will:
Be given a temporary ban from the forums, depending upon severity
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Or it could be because they're trying to appease their Chinese Lord and savior Winnie the Pooh.