It's on the Apple App Store, but not on the Google Play Store (since November 2020). The officially stated reason is something about a change in file formats, but that seems like a flimsy excuse for being unavailable in the most popular app store in the world for an entire year.
I also installed it on an unused spare phone, and consider that device tainted forever.
I know that doesn't answer your question regarding ethics, but I absolutely don't trust them from a security perspective. Very good product, though.