From the perspective of someone in the UK, the ongoing shift in government and society towards openly discriminatory/suppressive policies aimed at some minorities (trans people, certain ethnic/cultural groups) and the accompanying moral panics to that effect make the idea of the state running, monitoring and controlling social media as a utility a bit terrifying - particularly for something so fundamental to modern life.
A lot of the issues with centralised social media in private hands would just be intensified if the state were directly running the show - it can’t be trusted to act as a benign, responsible steward.