Not by default though and this is terrible UX. Everyone who claims that they have a good feed also makes a point of stating something like 'you need to curate your feed'. It takes active intervention to prevent the app from disintegrating into a toxic maelstrom - this is a serious problem. And sometimes it is hard to unfollow people you are close with in person but are obnoxious online (it can be awkward). The app's default behavior is not the responsibility of the users, it belongs to the company.