You know what I am going to say... Google Play is owned by Google and is a private platform. They can remove, ban, suspend any app or app update they want when it breaks their policies. That is tough.
The "Mah private company" defense is flawed on many levels and you should really stop using
1. Just because they have the right to do it, does not mean people should not criticize them for it. Simply stating they "have the right" is meaningless and does not add anything of value to the conversation
2. There is a overlapping and complex set of principles and laws at play here. There are many avenues that can be explored from a legal front when they ban a company from selling their product on their walled garden, even outside of the Anti-Trust issues there is also contract laws that can be used, and even Deceptive Trade regulations given the uneven standard that their policies are applied.
So it is not as simple as say "Well there are a private company they can do what they want" The law, and society is far more complex than that, and it is time for people to stop using this useless platitude as a defense of bad actions