What's Wrong With Google Play Top Rankings?

Question

Android

I read a lot of articles, both on Habré and just on Google, but there is no specifics there. Maybe you can suggest something from your observations?
Question 1
How long is an app considered new ? I saw in the tops of new (both paid and free) applications both a month ago and a month and a half ago. After what period of life does it take off from the top of new ones? Do updates affect this?
Question 2
If an app didn't make it to the top new ones during the first or second week of its stay in the market, will it still have a chance to get there? How long does it take for an app to get into the top new (at least in its category)?
Question 3
If an application drops out of the new top after a certain time (because it will no longer be new), will it fall into the usual category top? Or can it get into the regular top while still in the new top? And if it does not fall into the regular one, does this mean that it will sink and go to the bottom of the market to other unnoticed applications?
Question 4
I know that tops are ranked differently in different countries. For example, on the second day my application was in the top new in its category at 208th place. Then during the night it gradually crawled to 204. I asked a friend from Russia to check (I myself am from Kazakhstan), he didn’t find it in the whole top (500 places). I took the girl's phone, she had my application in 163rd place. By the evening of the same day, it crawled over to 184 for
me. Excuse me, shta, as they say ?!
First, there are 10 times more installs from Russia than from my country. Why is it not in the tops of Russia, and is in mine? Well, okay, different countries, I understand, their own system. But, secondly, why is the application located in different places on different accounts in the same country and even in the same city?
PS
Maybe I didn't quite understand something. Reading articles on habré, I realized that the top system is very confusing, but usually very fair (with the exception of exceptions). But then I ran into abracadabra in the fourth question.

Answer 1

Question 4. Most likely, the issuance takes into account the user's history, his preferences, etc.
For all other questions, it can be answered that Google has not been famous for the objectivity of ranking in favor of payers for a long time.