[duxup]

If that is the reason they should probabbly do a better job of telling them (granted it's Google, they're terrible about communication in this way).

I think that is a valid reason, but it should be clear that is the reason.

[Bartweiss]

It's worse than unclear - the Google Play team specifically cited objectionable emoji, and included a screenshot of the emoji which is also found in lower-rated Gboard. It seems like Google actually made this decision clearer than most, and it was explicitly about the hypocritical part.