Pop-up ads, including those for online casinos, have been a concern for users of the PF site. While these ads help fund the platform, there are ongoing efforts by staff to remove inappropriate content. Users have noted that ads are blocked for contributors, and increased contributions could potentially eliminate ads altogether. Some users suspect that pop-ups may be related to adware on their devices rather than the site itself. Discussions also highlight the importance of reporting any inappropriate ads, such as those related to porn, as they conflict with the site's educational mission. Overall, the site is primarily funded by contributions and ads, with a focus on maintaining a safe environment for young learners.