I found this instance https://thefedi.forum/world (found here https://nodebb.fediverse.observer/list )
To follow a community, copy the ID of the Fediverse community, and on nodeBB click the magnifying glass on the right side to search and paste in the community ID in there (and delete the exclamation mark, like television@piefed.social)
change the dropdown to search “in categories” and it should show up like this https://thefedi.forum/search?in=categories&%3Bterm=television%40piefed.social
Open the community, click “Not Watching” to choose either “Watching” or “Tracking” and then new posts/comments will be synchronized in, and you should be able to join in on the discussions!
Of course, that’s the magic of an open protocol.