No public ability? Not sure if that’s said with a straight face, but there are a multitude of platforms to bind your comments to a particular article/post/entry/etc. Twitter, Facebook, Reddit, and Hacker News come readily to mind. There are many, many, many other ways of getting your opinion out there online.

Content producers of any ilk are in no way obliged (and imo expected) to provide and administer a public forum alongside their work.