Depends on how the word “showstopper” is being perceived here, you might find the following quotes, lifted directly from Tencent QQ’s software license agreement, a tad too funny or scary, even for the least paranoid western users.
Important Notice:
…the User should read carefully every article of this Agreement, including articles exempting or limiting the liability of Tencent and those restricting the rights of the User…
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5 Other articles
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5.2 Laws and regulations of People’s Republic of China are the governing law for the interpretation of, validity of and settlement of disputes arising from this Agreement. When any dispute or controversy arises between Tencent and the User, the two parties shall resolve the same through friendly negotiation; if the negotiation fails, the User hereby agrees that the dispute or controversy shall be resolved in the court located in the jurisdiction where Tencent resides.
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5.4 The English version of this Agreement is for reference only. In the event of any discrepancies or inconsistencies between the English and Chinese versions, the Chinese version shall prevail.
But think about all the video-chatting with random chinese models, made possible only by Tencent! (since they pretty much eliminate all third-party clients)