Is "censorship" what newspaper editors have done with letters to the op-ed pages for over a century? (Some made it, how many didn't? Most) How many TV News stat

Is "censorship" what newspaper editors have done with letters to the op-ed pages for over a century? (Some made it, how many didn't? Most) How many TV News stations air viewer responses? Is that censorship? Those businesses were mostly one-way from choice. In the same 'over a century' lots of people reacted by starting their own newspapers. Those papers too were 'echo chambers'. How are 'social media' more public? Is 'we guarantee to air everything' part of their TOS? Else, nothing new here.