I don't know how Wordpress or NextCloud uses it, but for my own use I'm considering building a comment system for my sites around in, on the basis that having comments about my posts exposed to the fediverse seems like a good way of increasing reach.
(there's the challenge of length; there's no problem upping the post-length for comments etc., but many instances will reject them, so you do face the issue of having to replace the body of longer comments with a link to a page, which is sub-optimal but doable)
(there's the challenge of length; there's no problem upping the post-length for comments etc., but many instances will reject them, so you do face the issue of having to replace the body of longer comments with a link to a page, which is sub-optimal but doable)