I'm not 'admitting' anything, just making an observation. Cultural changes can be positive or negative, or a mix of both, or neither.
I do sympathise with the libertarian take on this, if people like and enjoy Instagram that's up to them, but these social media platforms are not neutral channels. They tailor their feeds individually, to users who have limited control of their feed. The platform is in control and they manipulate the feed to serve their own interests.
I'm not going to say therefore we should do this or that thing, I don't know what the right thing is to do.
Would you accept that in principle the level of control platforms have over their feeds, and the incentives they have to do so, potentially opens them up to some level of responsibility for the consequences?