What does Ente mean?
In Malayalam, Vishnu’s native language, “ente” means “mine”. Thus “Ente Photos” has the literal meaning “my photos”.
This was a good name, but still Vishnu looked around for better ones. But one day, he discovered that “ente” means “duck” in German. This unexpected connection sealed the deal. We should ask him why he likes ducks so much, but apparently he does, so this dual meaning (“mine” / “duck”) led him to finalize the name, and also led to the adoption of “Ducky”, Ente’s mascot Source
Your arguments don’t really make sense in the context of you asking for Threema instead, even if you acknowledge that it isn’t optimal.
Neither does Threema, it is a closed eco system? And in fact there is Molly, a hardened Signal fork for Android
Threema is a paid app though. So you consider an app asking for donations worse than a paid one? I agree though that their financials aren’t the best, since they seem to be living off a loan, but thats even more an argument to donate.