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Re:Ask HN: What are decentralized Twitter alternatives? by Rumudiez on Saturday January 09, 2021 @02:16PM (#25703559)
> an app whose primary motivation is offering a comment section for websites that don't normally have comments

Disqus has done this to a fairly wide extent. They allow site maintainers to moderate comments IIRC.

Re:Ask HN: What are decentralized Twitter alternatives? by jaredsohn on Sunday January 10, 2021 @02:42AM (#25712020)
I think this is more about something like running a chrome extension to have comments without the site owner's involvement.

https://www.google.com/search?q=chrome+extension+comments+fo...