It seems that having free speech is a necessary, although not sufficient, condition to improve society. It's a principle worth defending.
My opposition to censorship derives from the fact that it tends to require an unjustified hierarchy (i.e. the violence of the state).
However, I have a real problem with imparting some kind of magical quality to ideas. I'm particularly annoyed by the way in which free speech advocates act like social norms are a form of censorship. More specifically, that free speech requires platforming -- i.e., rejecting a freedom of association.
While I do think that the power companies like Google exert of society is well wroth investigating, in general I find that these are much weaker examples of the use of force to censor ideas.
There's no natural inclination of humans towards justice or injustice, beyond the limits of our own psychology. To me, the idea that there is some internal teleology towards justice is absurd. These are material struggles and material gains that must be defended materially.
We should reject this kind of naive idealism.