From the
TOS:
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11. Third Party Products and Graal Online system. LINUX Cyberjoueurs does not endorse, warrant or guarantee any product or service offered through the Graal Online system by any third party, will not be a party to or in any way monitor any transaction between you and third-party providers of products and will not bear any responsibility for their products, policies or actions.
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It doesn't say anything about banning third party-transactions; just that it's not Eurocenter's fault if you get scammed.
Edit: Although the definition of "warrant" could go both ways, meaning "justify" or "authorize".