Earlier this year in February, Instagram started testing a feature that would inform the users if someone took a screenshot of their Story posts. The feature was in beta testing and only select users were part of it. The feature was met with backlash as users had grown used to taking screenshots of Story posts for whatever it is they intended to do with them. It's one of the things that made people prefer Instagram Story mode over Snapchat Stories as the latter has always had screenshot-warning built-into it. It seems Instagram has decided to hear its users on this one. According to...
Source: https://www.gsmarena.com/instagram_decides_not_to_roll_out_screenshot_notification_feature-news-31695.php
