We have tried Jitsi a few weeks ago. And we couldn’t scale to meetings with more than 5 people. We tried our own server and theirs.
Then there is Skype and Hangouts. With both I can only meet for two hours or so on battery.
Somehow Zoom works flawlessly. Very easy setup and it worked straight out of the box and is not CPU hungry.
The UX is also great. It’s clear what the buttons are and do. Compare that to Skype where it’s not even clear when something is a button, and even then it’s often just an icon, which means nothing to me.
The product is great. But you pay with your personal data, I guess...