I’d guess the simple answer may be that people don’t care/know, but for those that have ditched Facebook for whatever reason, yet still use Instagram, it’s a little surprising.
Is it partly a result of it being a more focused/limited form of social media that filters out some of the stuff people didn’t like from Facebook?
They are, and they are. But the vast majority of people love them. Short stupid videos in an endless feed that helps them kill hours each day. I never watch them so I am not fed all the time thankfully in the 5-10 mins/day I watch my friends’ stories