That might be true philosophically, but tactically it makes no sense to fork until a potential future license change. Why lose the free maintenance from upstream?
It's not open source, but up until a few years ago I used whereby.com for videochats.
Unlike the alternatives at the time from Google, Apple, etc., it didn't require an account for participants — I could just give them the meeting room URL. So although it wasn't open source, it at least didn't lock you into a network.
The chat seems extremely basic, so not really an alternative if you need chat with e.g. message edit/delete/formatting/pictures as well as video/audio.
We used to run this back in the day which, granted, was quite a long time ago now. I don't think we ever went longer than a few months without a serious outage of sorts, and that certainly wasn't for a lack of resources or manpower.
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