I have been running Jitsi Meet (https://meet.jit.si/) for a few years[1] for a group of friends to do their monthly meetings during the COVID times, and tried this out a little while ago.
I liked it, but there is still a fair amount of assemby required, and I hope they get it to the point where (like Jitsi) everything is a docker-compose away.
I'm in telco and I've done this all my career (actually started doing VC over ISDN as an undergrad), plus I could spare the cloud resources (a small 4 core VM was more than enough, and it was scripted to only be available - and with 4 cores - during work hours).
This is a fantastic idea not simply because of saving money, but also to keep work at work. Too often people slack after hours expecting an immediate response. Someone where I work recently went so far as to uninstall slack from their phone so they could have a proper vacation.
I always uninstall teams when im going on more then 1 week of vacation. I always disable all notifications and only 1 person at work knows how to get in contact with me in case of an emergency.
have you looked at running those cheap VMs from say lowendbox.com ? there are good companies like racknerd.com ? not a shill, just a user....
the reason for this is that i have "tried" to go and buy or use one of the 3 major cloud services but they are too darn expensive and complicated. this way you get a panel and an ssh and do what you want for a fixed price
You should be able to get much better value with a self-managed solution.
For instance, the server at <https://galene.org:8443> is running on a "Value" OVH VPS (<https://www.ovhcloud.com/en/vps/>) which is rented for under 6€/month. During lockdown, It was regularly used for lectures with 70 students or so, but that's an unfair comparison, since students tend to keep their camera off during the lecture.
I liked it, but there is still a fair amount of assemby required, and I hope they get it to the point where (like Jitsi) everything is a docker-compose away.
[1]: https://github.com/rcarmo/azure-ubuntu-jitsi - all my tweaks, ready to deploy