I just blame it on poor webcam support over Citrix for Linux. All others run Windows but some dont turn on video just because. Management raised the point of video for a while and then basically gave up. Good. For technical meetings you dont need to see my face to evaluate the merits of my point. Performance review type stuff is a different matter.
If it’s a purely technical meeting, I’d wonder why it’s even a call rather than writing. But I’d guess that some might disagree that it’s “purely technical”, and there the video call makes sense. Perhaps there’s more need than ever to establish a purpose for the meeting before you start.