An 1,5 hour i was banned by blizzard for using OQ, here is text (on russian), that i got from blizzard:

?????????? ????????? *** ????? ***


?????????: ??????????????? ??????? ???????????? ????? - ???? / ???????
???????? ????: ?????????? ???? ???????? ???????

?????? ???????????? ??? ??????? ???????? ??? ????? ??????? ?????? Battle.net, ??? ??? ??? ???????????? ??? ??????????????? ??????????? ?? ?????? ????????? ?????? ? BattleTag. ???? ??? ?????????? ??????????? ? ????? ??????? ??????, ??????? ???????????? ??? ???????? ????? ? / ??? ????????????? ?????? ??????? ??? ? ???-??????.

???? ?? ??? ?? ????????? ???????????, ??? ????????, ??? ??? ??????? ??? ???????. ?? ?????? ???????????? ?????????, ??????? ?? ??????? ?? ????? ?????: «????????, ??? ?????? ????????". ?????? ??? ?????? ??? ????? ? ?????? ? ?????????? ? ?????? ?????????, ????? ?????????????? ??????? ??????.

??????????, ???????? ??? ???????? ??? ????? ??????:
www.battle.net/security/help


================
For now i dint get any explanation from Blizzard.
They banned full account (wow,Starcraft,Diablo) only free HS is avaliable.
No information about time of bann is in letter.

origin message in russian, and cause of encoding bug for this forum its do not show correctly, so here is auto translate from google:
Blocking message *** ACCOUNT ***


Violation: Abuse of the system prompt Friend - Spam / Advertising
Action taken: Lock all gaming licenses

Blizzard has blocked all gaming license for this account Battle.net, as she used to abuse of the invitation to the friends of the present name and BattleTag. This type of lock is applied to any account that is used to send spam and / or advertise third-party services and websites .

If you have not sent out the invitations , it means that your account was hacked. You should use the tips that you will find on our website , "Help I got hacked " . Serves to protect your username and password and contact support to unlock the account .

Please visit this page as soon as possible :
www.battle.net / security / help
====

edit: I think ive fixed the character encoding, however i re translated it from english to russian, so things may not read correctly.

Blizzard has stated numerous times that using oQueue is fine and that they encourge its use. If you feel they have wrongfully taken action against your account you will have to take it up with them. If they did not want you using oQueue, they would have banned oQueue, they have stated numerous times that when they do not like a addon, they ban the addon, not the persons who are using it.

Sorry, but we cannot be of any help with this issue.

Sources:

http://us.battle.net/wow/en/forum/topic/10673187452#6

http://oq.publicvent.org/is-oqueue-safe-to-use/

http://i2.wp.com/oq.publicvent.org/wp-content/uploads/2013/12/oqueue-safe-blue-post.png