VKontakte allowed community administrators to hide the list of their subscribers. When you enable this setting, users will see only their friends and the total number of participants among the members.
Social networks believe that this should help in the fight against spam mailings. Competitors will not be able to track new subscribers and try to lure them to themselves.
For niche authors and event organizers, the ability to hide subscribers will be a useful tool to prevent them from being persecuted for their interests, views, and beliefs.