Already deleted my facebook - not much stopping me from deleting my instagram next. But i'm not a very active user anyway, so i'm not sure if it'll make its way into the few folks i follow.
But for people who mistrust Facebook, that is more than reason to drop Instagram. The thinking is, "I've seen what Facebook has done to itself. It's only a matter of time before they do the same to Instagram. I might as well get out now and find some better alternative."
Speaking of dark patterns, few people probably ignore Instagram long enough to notice, but after weeks and weeks the app starts showing you head-fake notifications. They aren't mentions or messages, just 'alerts' that people you know are using Instagram and you should be looking.