If the same software could be used without the security concerns then I don't see how competitors at their current level would remain anything but a side note.
I have brought up Jitsi, no one cares, perceived as worthless fringe. Enterprise client already has MS Teams licenses, again no one cares, only used when Zoom is no option. Internally we got Slack, cannot even do 1:1 calls without issues. We also have Pexip, it has crappy UI/UX and several disconnects if sessions > 30mins. Hangouts is Google so enterprise clients are often not getting into that.