And to highlight the lack of Internet Safety many are using Google services. Youtube gets hacked and accounts taken over.
There are some amazing learning portals out there that can be used that are a lot safer than many mentioned on this thread. Easy to use, properly stored, secured etc.
However, they come at a cost. Where does this money come from? Before now, schools in the UK haven't needed to provide on-line education. Some schools do but on a much smaller scale.
Recording, editing, uploading etc all take time. Although the lesson is an hour, it will require more time for recording. If you really think it's that easy. Talk about something you are passionate about, produce a one hour video and upload it to Youtube. And of course, we want to see you in your normal home workspace and recorded during a typical one-hour time-tabled lesson. Share it with us, and then tell us how easy it was, and how you enjoy being publicly exposed in such a way.
We also have a little policy in the UK about how we can share our picture, and this extends to online presence. Last time I worked in education, a part of the Internet policy I signed ticked hell no to videos of me being shared online. If I wanted to be seen online, I would have gone down that path.
You cannot force people to do something they are very uncomfortable with. You cannot force people to cross their own boundaries, and nor should you.
Don't forget teachers across the globe are advised about how to safely use Facebook so students/parents cannot find them. Their SM accounts are all locked down.
Oh and technically primary schools shouldn't be using Google Classroom, youtuve etc. It violates their t&c's as all account holders should be over the age of 13. Which goes back to E-safety and safeguarding.