Conversations is paid and has like 100k downloads, and it looks like it's from Android kitkat. The other two don't even exist on the app store. Do you consider these to be popular? I'm looking for actual popular apps, just like I can say Element for Matrix.
Wat. Conversations is on F-Droid… and it’s the basis for Blabber, Cheogram, Monocles, etc. It’s the most influential XMPP application in the Android space.
Also for the sake of chat, what’s something truly innovative since the heyday of AIM & IRC? There just isn’t many useful bells & whistles to be added in the last decade. The newer XEPs for stickers+message reactions have been out with some new clients picking them up, but these aren’t something fundamentally changing how folks speak.