Hi Sergiy,
I don't see how this can be outside the scope of your standard support.
It is a standard feature of Appery that a youtube element can be used.
I am using it in the standard way without modifications.
This standard Appery method is being rejected by Google Play for the reason cited.
Therefore the standard way of implementing the youtube element by Appery is not viable.
Unless you can tell me that I am doing something non-standard when you took a look at the COYA app that has been shared?