More precisely the tablets. Apple tablets are supported, but in all the years I've used adobe they've never developed for Android tablets such as the Galaxy Tabs. I liked having Premiere clip on my S7 phone to do quick edits while I was out and about; but I certainly would of appreciated more screen realestate to edit on. I had to download Cyberlinks mobile Power Director to have something that I could edit with on my 10.1 Galaxy tab.
But before I ramble too much, I'm seriously wondering why doesnt Adobe in years upon years not develop mobile apps for both the Androd tablets and Android phones ?
Feature request, How to, Mobile version, Performance
I don't work for Adobe, but I can certainly speculate.
There is an advantage to creating software for Apple. Apple builds operating systems and hardware. Their OS isn't trying to be all things to all people, like Microsoft's. They just have to match a dozen or so cofigurations. Develop a product for Android and you're trying to fit with hardware configurations that follow no standards. Samsung's Android products are quite different from Motos, for instance.
That said, I'm not sure Adobe focuses on creating software for Apple. In fact, Apple and Adobe are constantly at odds, each blaming the other for software issues.
Rush is early in its development, so it's not available for every Android device. Might never be. But that's only because there's so much ground to cover out there. It's certainly not because Adobe likes Apple more.