Yes, but that's not a protocol. That's uploading a key to a server. The protocol is WKD and Proton doesn't respect it. Me opening an account on GMail doesn't m

Yes, but that's not a protocol. That's uploading a key to a server. The protocol is WKD and Proton doesn't respect it. Me opening an account on GMail doesn't mean I want people to contact me on GMail. If our protocol, ie you asking me what is my email and I don't give you my email then I don't want you to contact via my GMail account.