I'd rather have nothing to do with weirdos who require an "app" to communicate, and I say that having been using voice chat online since Iparty. (1997)
Iparty. Battlecom. Roger Wilco. Ventrilo. Teamspeak. Skype. Mumble. Discord etc
Until recently, you could host your own server on most of these. I want to go back to that. I'm sick of relying on other people for things to be up. Jitsi Meet is great.