According to the OP, the banning of replys in the classifies was the result of: "After too much time spent modding frequent needless comments in classified ads". So "needless" comments triggered the ban. (Sound familiar: you do not need those comments or an AR-15?)
Not even close to being a direct correlation. You're trying to equate a right and restrictions on the government with a private entity that has zero obligation to let anyone have an opinion.
This is a good example of what he's talking about. This ad had 22 replies after it was sold and 4 bumps in the first hour with comments that added nothing or asked a question about the item.
https://gulfcoastgunforum.com/threads/gone.59354/