Zoom has an article on settings and practices to prevent unwanted participants or harrassment (the equivalent of modern day prank callers).

  

https://blog.zoom.us/wordpress/2020/03/20/keep-the-party-crashers-from-crashing-your-zoom-event/

 

One best practice is to be careful with your personal meeting ID.  

 

A couple of reminders on using Zoom to host public events:

  • When you share your meeting link on social media or other public forums, that makes your event … extremely public. ANYONE with the link can join your meeting.

  • Avoid using your Personal Meeting ID (PMI) to host public events. Your PMI is basically one continuous meeting and you don’t want randos crashing your personal virtual space after the party’s over. Learn about meeting IDs