I don't really care the content at all, but I really wish these platforms took the "phone company" approach, in which they considered themselves neutral carriers of information. In the US, I don't know an obvious issue besides legislative change to enforce this. However, once they consider themselves as "curators" of information with near-monopoly status, I hope they are litigated against successfully.
YT, FB and other platforms would like too. For them, more content = more viewers = more ads. The current situation is because governments passed laws to regulate the type of content they are allowed to show. The "phone company" is not the right analogy. They are more like mass media (TV, news papers, etc), which is the rational for censoring them
For example: They could easily - but actively choose not to - host pornography.
They do not want to host everything that is legal.