That tweet is drawing a very specious connection. Android did not, as far as I can tell, copy any of Apple's algorithms or piggyback on top of them. It is a novel implementation of some of the same ideas in the iPhone.

Similarly, it's plagiarism if you take a Harry Potter book and publish your own version with the names changed, but James Patterson's "Witch & Wizard" has a copyright of its own despite being rather similar in concept.

(Edited to remove question about phrasing thanks to atularora's clarification.)