In March flight schools closed for several months allegedly because of Covid-19 pandemic.
Why the "allegedly"?
AFAIK they were closed for the same reason other educational institutions full of young, healthy individuals were shut down, e.g. schools and universities..-social distancing. It was done to stop Bloggs and his mates catching the disease in a class room or crew room from a fellow student and then going back out into the general community and spreading it to those more vulnerable such as perhaps their parents and grandparents.
( BTW I know of Class one medical holders who have been advised to "screen"/ treat themselves as vulnerable individuals and take suitable precautions because of their medical history - having a Class One doesn't mean you are a superman or a superwoman... )