There have been reports that Flinders University does not allow Zoom on its system. It appears that Sydney, Melbourne, Adelaide and UniSA are all using zoom extensively.
Zoom has upgraded its procedures and now the default setting is for people coming into a meeting to go into a waiting room where the host admits them, checking their name. The latest upgrade to Zoom 5.1 includes increased encryption and Roger Bills advises members to check that they have the latest upgrade. To check if you have the latest, do the following.
Open your account button (top right, with green dot) and go to Check for Updates.