I don't know if this is it, but this is listed in the terms of use for mobage:
It is always hard to decipher what the terms of use is attempting to express.
General Prohibitions
You agree not to do any of the following while using our Services, ngmoco Content, or User Content:
Attempt to access or search our Services or ngmoco Content, or download ngmoco Content from our Services, through the use of any engine, software, tool, agent, device or mechanism (including spiders, robots, crawlers, data mining tools or the like) other than the software and/or search agents provided by ngmoco or other generally available third-party web browsers (such as Google Chrome, Microsoft Internet Explorer, Mozilla Firefox, Apple Safari or Opera);