Sorry of it appears shady. It's definitely not supposed to be. Although I submitted the apps myself, I talked to a few of the authors beforehand. Some were excited to have an potentially additional source of income as (who would have guessed it) their donation buttons don't yield a lot. Others didn't really care and wanted me to donate any profits. This first version is more an example how things could look like, and I hope that the respective teams take over their apps in the future and that developers submit new apps themselves.