[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: 4.8 We may revise the pricing for Virtual Goods and Virtual Money offered through the Services at any time. We may limit the total amount of Virtual Goods or Virtual Money that may be purchased at any one time, and/or limit the total amount of Virtual Money or Virtual Goods that may be held in your account in the aggregate. You are only allowed to obtain Virtual Money and Virtual Goods from us or our authorized partners through the Services, and not in any other way."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]