I believe that there are those who criticize only because they do not have the power to ban or suppress.
Of course there is such a thing as constructive criticism. The critic does not wish that you would disappear, or crawl off in a corner and die. The constructive critic wants to see you continue to express yourself, but in a manner which they deem superior.
I wrote in haste, which allows me to repent and edit in leisure. Perhaps it would be more accurate to say that criticism is censorship inchoate.
We might examine St. Pauls passage, in one of the Epistles, regarding the gradual process that someone is reproved, corrected, but, if they do not change their ways, ultimately censored and excommunicated (and, in later centures, burned at the stake).
For me, this is an interesting and valuable topic.
We must have rules and conventions, in forums, schools, and societies at large. But those who do not conform are punished in some way, either with a failing grade, or a locked thread, or a court fine.
Where does one draw the line? When does friendly constructive criticism cross the line from a suggestion into a deman, and then a threat, and finally a consequence?
Total, absolute freedom, would mean, I suppose, no rules, no criticism. Certainly, those reclusive writers could find such freedom only in their seclusion and anonymity.
I suppose, in an odd way, praise is a reverse form of criticism, and something which can be used to control us, to direct us.
I certainly think that Sartre's rejection of the prize was his way to escape the golden chains of that reverse form of censorship; public acclaim and approval.
Look at those threads which discuss the best seller over the classic. The purchasing power of the public, and the best-seller lists, control various popular authors, who write only in a certain style, in order to insure continued income.
Consider Roman Catholic theologian Hans Kung ("On Being Christian"). His books were not burned, but certainly he was censored and censured.