[android-developers] Live Wallpapers by different developers with suspiciously similar descriptions

Lately, I've noticed that there are many live wallpapers, by different developers, which all contain the following text as part of the description:

To use: Home -> Menu -> Wallpapers -> Live Wallpapers

To develop more free great live wallpapers, we have implemented some ads in settings.
Advertisement can support our develop more free great live wallpapers.

This live wallpaper has been tested on latest devices such as Samsung Galaxy S4, Nexus 7, HTC One and Sony Xperia Z. Please contact us if your device is not supported.

Note: If your wallpaper resets to default after reboot, you will need put the app on phone instead of SD card.

What's particularly odd is that they all claim to be tested on the same set of devices.  Furthermore, most of these live wallpapers seem to be static images with some objects (most commonly, bubbles) moving in front of them.  Occasionally, they will have some kind of wave-distortion effect in the middle of the screen.

What is going on here?  Are these apps being auto-generated by a program?  Are they attempting to imitate one developer?  Are they all made by the same developer under multiple aliases? 

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