Completely free, for now.
Several cheaper , better competitors exist. Discord too.
But we had a bit of friction. My friend had to install the Pop application for screen sharing.
No one knows what Pop is. I feel like if I was hosting a class with strangers most people would refuse to use Pop and insist I buy a Zoom subscription. At the point I'm hosting a class, I can find 15$ a month for Zoom.
All of this despite Pop being a better experience.