Have you looked at their policies that they suddenly support after they opposed them because of Fiber? Have you seem Google ("Niantic") issuing cease and desist orders to people making Ingress clients because their support for devices is shitty and broken? Banning accounts for using those clients even though they don't give any advantage? Cease and desist and banning accounts using the iOS client because they're taking forever to release an official one? All of these are open source stuff.
And no, I didn't get banned. I use the official client on the S4. I just think it's really shitty of them.