The pitch is that you can go `curl -d "My message" ntfy.sh/my_topic` and it just works. That's impossible if you want E2EE.
Fortunately, it's open-source, so if you really want, you can fork the app to add a decryption layer and then use `curl -d "$(echo "My Message" | openssl enc -aes-256-cbc -pbkdf2 -e -k "My Password")" ntfy.sh/my_topic` and that'll be E2E encrypted.
Or, you know, host your own ntfy server and trust in SSL.
You have perfectly captured my intention. :-) ntfy is supposed to be simple simple simple.
E2E stands in the way in many ways. I have implemented crypto formats and such in the past, and the lack of a standard in this space is really blocking wide spread adoption and interoperability IMHO. That said, I have proposed a design here (https://github.com/binwiederhier/ntfy/issues/69#issuecomment...) that I have already partially implemented, and that seems easy enough to implement in many languages. But it definitely won't be the one-liner anymore.
Fortunately, it's open-source, so if you really want, you can fork the app to add a decryption layer and then use `curl -d "$(echo "My Message" | openssl enc -aes-256-cbc -pbkdf2 -e -k "My Password")" ntfy.sh/my_topic` and that'll be E2E encrypted.
Or, you know, host your own ntfy server and trust in SSL.