I was doing a code review of this module and came across the following text. It appears that if the module is enabled for a certain period of time, a nag-screen is enabled in the admin section of the module asking for donations to a list of specific charities. It doesn't mention that not donating is also an option, so I could see users unfamiliar with the GPL thinking that they would have to donate to continue using the code legally.
The most offending line is "The outline module is charity-ware". I'm guessing that if it was changed to "The outline module is licensed under the GPL. If you find this module useful, consider donating to the following charities.", there would be no issue.