I agree with you in general. But would like to add that effective monopolies like youtube should be excluded. Censoring something on youtube essentially means it censored completely for video platforms.
Excluding porn youtube is essentially a monopoly. If you can't go to youtube you immediately land in very small and obscure video streaming sites.
If you compare this to the "real" world it would be the same as not being able to say what you want in public spaces. Youtube is THE public space for video content.