@dansup @supapp man... I thought of this when I was working on the Alert Retrieval Cache way back when and never followed up. The idea is had at the time was pop encryption that could be transmitted in multiple ways, though I was more focused on asynchronous communication leaning toward SMS.
kind of got lost in the shuffle of... life? Twitter started, the tempo shifted, and enshittification began.
But yeah... it should not matter the service. It can be completely agnostic.