It is best to avoid third party applications if at all possible unless you have them on your own server.  Jisti meet may go the same way in the future and suddenly your members can no longer do any sort of video conferencing.  Of course UNA might can provide access to a Jitsi server at a reasonable monthly price.

Jitsi software is licensed open source, as you say it is the Jitsi server that is the kicker. As you say, we could establish a paid service is this was ever required. We have this already for UNA.IO and have set up Jitsi servers for a number of clients. 

But yes 3rd party intergrations are generally a pain, they start cheap but rarely remain so.   I remember when Mailchimp was cheap, their skyrocketing prices was one of the key reasons we developed the UNA Mass Mailer Module.