Venomancer I don’t think it’s comparable with WhatsApp, because WhatsApp is closed source and we have no way of verifying their claims. On the other hand Stingle Photos is open-source and anybody can verify that it doesn’t do anything nasty.
Now about the ML. I understand the psychological thing that people just try to stay away from it no matter what, but given good cryptographic design, it can be as sexure as the rest of Stingle Photos.
What about the inclusion on privacytools.io?