Hi, I am Alex, the creator of the mentioned service, JustComments :-) I have completely missed the post initially. If you have any questions about JustComments, feel free to ask! By the way, I have open sourced the frontend part of the service recently github.com/JustComments/widget Maybe it will be of interest to some of you! :-)
There is a basic open-source backend implementation for JustComments which allows self-hosting: github.com/justcomments/jc-server
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