I have just watched the full insta that Nicki posted yesterday about her FIL's death. As
@londongirl2001 pointed out: she has decided to "turn off comments" because they will be "overwhelming".
She earns a living from the fans that follow her. They subscribe to her youtube and insta channels, they tick the like box, they improve her youtube status each time they comment, they buy her books, they buy her soap, they buy into the whole Positano lifestyle that she has shown on her vlogs. She has told them about her family and encouraged them to feel part of her life by asking their opinions about various things.
Most of these fans know that they are not 'real' friends with her, they are just her meal ticket. But they are human too, and over time they genuinely begin to care about Nicki and her friends and family. Carlo in particular is loved, not least because he seems to understand that communicating with their fans through the comments section helps to build their popularity.
So now, when there has been a sad death which will affect Carlo profoundly, she decides to cut off the only way that the fans can use to show they care -
she turns off their chance to extend their condolences ??? IMO this is cold and mean.