Apple didn’t steal anything from other OSes. Both Apple and other OSes got those things were from the iOS jailbreak community, though OSes with lower quality control ripped them faster. Since jailbreakers no longer exist, Google has no source of “inspiration” except Apple itself.
This is a really weird take. No mobile company today, including Samsung, has to give two craps about accusations of copying. What they're all doing is a load of work and well differentiated from each other.
What, if anything, would you improve about the iPhoneX interface?
What, if anything, do you think google should improve about their interface?
If Apple have the pinnacle of gesture interfaces then what is the benefit for Android in changing to the detriment of the experience?