Yes, those are ads on the demo.
I’ve added ads to the demo site. I’ve gotten a total of 2 donations over the time that I’ve released the source, and currently not even putting a lot of time in the project. I have ideas for how I can improve the libraries, which will include a major rewrite. As I’m not working on appengine these days, I have little inclination to take up that project, so I’m curious if there’s enough traffic to generate revenue from advertising to keep me interested in supporting a project I have little use for at this time.