You can run video lessons so only the teacher sees all the videos! And what do you think the rest of us are doing? There are children popping up in my video meetings all the time
Some teachers, and their children, are vulnerable themselves. Think domestic abuse and restraining orders, re-location etc. Children, in their infinite wisdom, think it utterly hilarious to take the piss out of teachers. We work very hard (or most of us do) to keep ourselves as anoymous as possible on social media (including many who have dispensed with it all together or who use fake names and are not friends at all with anyone they work with) but still we have incidents of our heads being attached to naked bodies...you get the idea. It is not good and potentially career-ending. Some of us hide for other reasons as well. We cannot have a situation where a vulnerable teacher and his/her children are exposed to an abusive ex through a video 'innocently' published online by students - simple things like ornaments, the view from the window etc. are enough for those looking to cause trouble to suddenly be aware of where their ex is. No way on earth would I allow myself or my children to be exposed in this way.
You will be additionally aware, as a parent, that you sign paperwork in schools about photos and whether or not you consent to photos being used for school publications, the website, or the local press. The safeguarding of children is absolutely paramount in these situations and what you probably aren't aware of is that we cannot, under any circumstances, take photos of children who are in local authority care. There is a reason for that. The same as teachers who might need protecting, some children also need protecting and a school cannot, under any circumstances, risk some idiot with the ability to edit photos releasing stuff photos and other information into the public realm.
Presumably, in a professional environment, people are not keeping, editing and uploading videos of their colleagues. It doesn't have the same appeal when once you get past about the age of 16. You also know and understand the risks you are taking as an adult. However, I would be prepared for a rise in attacks that have come about as a result of video-confrencing where a colleague posts something online and an ex sees it - if you know your ex works in X profession, it's not hard to keep an eye on such workplaces through social media and so many people are lax with their settings, it doesn't take much if you are determined.
And some schools are doing it. And very successfully
Yes, I agree. Videos are not the only way. I am teaching online 3 days a week from home for a private school. I am able to chat to students but they can't see me, nor me them. It is safer that way. Zoom and video conferencing is not the answer and it is worrying beyond all reason that some schools continue to engage with it.