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They have released iOS only apps before (see the Gboard), but specific to this one, it works with iPhone 6's live photo feature. This is where the phone records a three second movie clip starting 1.5 seconds before and ending 1.5 seconds after you press the shutter button. It makes sense that this would be an iOS only app given that most Android's don't have a live photo feature.

In a way it's kind of a healthy thing. Google research isn't so locked down that they're prevented from releasing something cool that only works on the platforms of direct competitors.

Google Photos will already make looping animated gifs from burst/series photos. I think this specifically does it with the burst/series photos that make up Apple's Live Photos. Essentially, as far as I can tell, it's an iOS-only app because the specific format of Live Photos is iOS-only.

(please correct me if I'm wrong)

It's not due to fragmentation, it works with the iOS Live Photos features on the 6s and 6s+. Android doesn't have such a feature (at the moment, I'm sure it will soon).

iPhone 6s only

Why should they preach to the converted?