Hm. It's weird to dump growth and discovery into one pot, unless growth has a specific meaning there. You need to be able to add new users to a service... other

Hm. It's weird to dump growth and discovery into one pot, unless growth has a specific meaning there. You need to be able to add new users to a service... otherwise it's kind of empty, which defeats the point of a messaging service. Discovery I agree is a trade-off of security vs usability / service attractiveness. I'm fairly certain you could create something very hard if you assume 2 users meet in person once to exchange long identifiers and keys via QR-code scans. Add in burner phones and/or public WIFI and tracking that stops being feasible and you'd rather follow the human. However, that'd be very inconvenient and maybe impossible for many - and you'd be back at empty. And possible to target entirely.