When I click the share icon, iOS 13 includes suggested contacts. First of all, the suggestions are terrible. And they are made worse by the fact that if I click on some of them, they actually message more people than the one listed. For instance, my father is listed as a share sheet person. But when I click his name and photo, it sets up a message with my mom and him together. So, the consequences of this were made very clear to me when a friend of mine said they sent explicit pics to their partner, which also included their close friends. The share sheet is dangerous!