@baconandcoconut We used BBB to run the Linux Plumbers Conference entirely online during the worst of the pandemic. The conference brought in 700 or so people, and we had individual sessions with as many as 200 in them.
I wrote a bit about the experience at
https://lwn.net/Articles/830436/We used fairly hefty cloud instances to host it - too hefty, really, but we didn't want to risk problems.
The scalability point with BBB is really the number of video feeds you have going at any time. Once you approach around 20, things tend to fall apart - on the client side, not on the server. We established a convention that you only turn on your video when you are actively participating in a discussion, and really didn't have any problems.
I routinely host meetings of 10-12 people on a server hosted on a two-CPU basic Linode VM, and it works great.
Feel free to drop me a line if you have questions.