Using jitsi this week while tethered (read: paying per Mb) I'm very inclined to disable the video of other participants - for myself only. Making the difference between ~100kbps vs ~2mbps, saving 95% of the cost on a two hour meeting.
I have control of the server as well as my client machine. I could optionally perform some network-level blocking server- or client-side to prevent the video content being requested and/or served. Ideally I would like something configurable that I can share with colleagues.