While commendable, I don’t think this approach is useful. I also had a professor that only wanted to use FOSS for its students but the reality is that university should prepare - at least to a certain degree - for work. The radicalization of this approach leads to students that land their first job without knowing how enterprise commercial software work lacking therefore a very useful entry level skill.
The delta between Jitsi Meet and Zoom or Teams for video-conferencing is minimal from a user experience perspective. The idea that a CS graduate from MIT would struggle to figure out Zoom or Teams at their first job is laughable.