All I know is that Facebook/Whatsapp are not going to disappear in the near future. 99% of people don’t
care about privacy because of the “I have nothing to hide” ideology.
So you end up with 2 kinds of people in your contact list - the ones who use Signal/Wire and are both
privacy and Opsec aware, and the rest who use Whatsapp/Messenger and don’t care much about
metadata sharing. The encryption in Whatsapp is actually very solid (it uses the Axolotl framework from
Signal, which is audited and reviewed).
I don’t see any one of my contacts switching to Matrix just because it’s not audited, got hacked recently,
and just there is no sense in an exotic new tool when you have Signal for 1% and Whatsapp for 99%.
They both have better security than Matrix.