Fwiw, most school districts also already have either MSFT Teams or Google Classroom licenses so switching away from Zoom shouldn't be too problematic for ad hoc lectures.

My district started with Zoom in the spring, then switched to Meet when the Zoom security issues got hot, and ultimately settled on Webex for the fall because it was the most like Zoom, carried enterprise support, and because Meet is still missing far too many necessary features for teachers (breakout rooms, raise hand, etc).