These developers are scum and Google needs to step up to the plate and make sure the apps have legitimate licenses for the images in the apps or disallow the thieves from ever putting them on Google Play.
In case you hadn't noticed, scraper sites like these tick me off. Our images are copyrighted the moment we take them and they are not to be used without our permission or authorization.
It is my opinion that "Free Wallpaper" sites like this one need to be shutdown permanently for copyright violations and we have to file those complaints against the copyright violators to do that.
I am a photographer who is really sick and tired of Image Thieves. I am disgusted with people who do not consider our photographic "work" valuable and that it belongs to us.