The scheme of monetization of the free app via donation is allowed or not?

In the play a lot of apps pozhertovaniya developer on program development or expression of gratitude.
But rereading https://play.google.com/intl/ru_ALL/about/monetiza...
The payment system of Google Play content not supported for the following types of products and services:
A one-time transfer of funds. These include loans, online auctions and donations.
or in the English version
One time payments, including peer-to-peer payments, online auctions, and donations.

Has "buy me a coffe" it is a violation or not ?

Or forced into
Resolved:
Additional features or special content. For example, the ability to view the app with no ads or features that are not available in the free version.
March 19th 20 at 09:05
1 answer
March 19th 20 at 09:07
Yes is allowed but about this:
Additional features or special content. For example, the ability to view the app with no ads or features that are not available in the free version.

It says something about what you can buy for example remove all ads for$ 2 or you can sell levels are not in the free version of your game
It was sarcasm. Practice shows that a free app with no advertising has received
traffic from the related (similar).
The closest analogue is free and without ads is a "pay if you want" (Donato).
while donations to 4-5 bucks a month through review of get 500-600 hits. - Rhoda69 commented on March 19th 20 at 09:10

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