Google Meet is built into GSuite, accessible via waffle, meet.google.com, or app. Simple share via URL, code or attach video meeting to Google Calendar invite and guests can join, they do not need a Google account to participate. It meets same compliance as other Google core services (citation - thanks @NASTECHtweet!)
Set up check in calls with your class
You can use the same nickname everyday to make it easier for attendees to find the meeting
Host office hours and encourage attendees to be mindful of the whether or not they have the video on
Put meetings directly on the class calendar