>> some shuls restrict to members only
“members only” is another issue. I am talking about travel/quarantine – whether they are covered by minyan or government rules. I know of lot of people, whether Jews or non-Jews, disregard them. This is how pandemic travels and evolves.
a WHO member says that he realized what quarantine is only when he was in China – they were taken from a side entrance from the plane to the hotel and were treated as biohazard.