After looking for a good commenting plugin, I reached the conclusion that no excellent option exists. I finally chose giscus.
It is based on GitHub Discussions. You need to authorize it to access your GitHub account to post a comment under a GitHub Discussion related to the blog post. So no anonymous posting, which is pretty suboptimal.
If you don’t want to authorize giscus, you can go to GitHub Discussions and post your comment there yourself. Or you can choose not to comment. Unfortunately, I do not know of any better option that does not require self-hosting and is privacy-friendly too.
And happy Nowruz, btw. 🙂