NOTE: I don't know what Zom is so ignoring it in the below. Viber, WhatsApp, Signal, Telegram, Threema and Discord are all built on the same paradigm: accounts tied to a single service and thus the inertia of network effect makes vendor lock-in a real problem when acquisitions happen or Terms of Service change. Signal is in theory the "best" of these 5 options in the short-term, but it being open source is utterly ir…
https://www.youtube.com/watch?v=Nj3YFprqAr8
Its been a year and I'm still not sure if I agree with him - which is the sign of a very juicy talk!