Then I built an alternative using free Cloudflare Worker
https://github.com/est/req4cmt
It's a simple service that transform comment POST form data to JSON, append to a .jsonl file, then do a `git push`
It renders comments by `git fetch` from a .jsonl file from a remote repo, or simply via raw.githubusercontent.com if your repo was hosted by Github.
The advantange over Github issue/discussion based comment plugins:
1. All data is stored a .git
2. no login of any sort
Github OAuth login might leak all your repo data along with your `access_token` to the plugin provider.
The `git push` works for any remote. You can choose github/gitlab or whatever.