Apps get access to a lot more data than the browser does.
Indeed, it's profitable for the developers (leeching users' data) but not the users.
Agreed. In my experience, the apps usually have a far worse UI than the websites. Often worse performance, too.
Or just kept using their web page?? I'm pretty sure that I can still access NSFW content in Safari.
I never understood what's the point of website-specific apps - like HN app or Reddit app or even Facebook & Twitter app - except of course some middle manager's quest for promotion.