It says powered by Postman. Postman is an app from Freeverse that allows you to make and send post cards to people. Maybe they are advertising a new game while also promoting one of their current apps? EDIT: Here's the link to Postman , for anyone who wants to take a look at it:
Thats what i thought at first too. However it does look like its a image from a game, so maybe they want to promote both apps. who knows.
That is what I thought. Seems they are promoting it through their other apps like other devs are doing with their games.