alt Hacker NewsVisio with live kit (part of lasuite) or opendesk with jitsi would be my guess.
https://livekit.io/ https://www.clever.cloud/product/visio/ https://lasuite.numerique.gouv.fr/
https://jitsi.org/ https://www.opendesk.eu/en
As an aside I am surprised it has taken this long but seems inevitable now given the last 18 months.
My bet would be that "the standard" will be Heinlein Groups (company behind mailbox.org) OpenTalk (already better than Jitsy) and now they are doing OpenCloud as scaleable NextCloud alternative. The company behind the projects needs it for their own usecases, has stable business and they have decades of experience.