Who I maintain relations with and who I don't is not other people's business similarly who I follow and who I don't follow should not be visible to anyone except me but that is not the case.
I can go on and on about similar things but the bottom line is everything on Instagram is designed in a way such that it generates more activity on platform and ultimately more revenue. This is true for almost all the social networks though. A social network that respects norms of our society and does not attempt at maximizing revenue at users expense will probably fill the void left by the existing ones.
We have regulation that somewhat works (there are exceptions of course and corruption is a thing, but at least there's an attempt) for other negative impacts on society (environmental damage, etc) but absolutely nothing for tech despite these new apps & services turning people into addicted zombies.