There's a million reasons someone may not be comfortable having their video on that don't involve fraud.
It might be that I am in a strategy team as opposed to engineering, so I have to collaborate and discuss items with members from other teams almost every meeting, and therefore relationships are much more important.
I have literally never turned on my video despite 2+ years of working remote. None of my team has either. The only people who ever do are director-level and above.
You are out of touch. Not every workplace is your workplace.
It's not necessary to have the camera on most of the time but there's something a little sad about the lack of human experience in never even seeing who you work with. Vision is our most powerful sense and deeply rooted in our social psychology.