PieFedIdea: Allow users to subscribe to threads they didn't make so they can get alerted of top-level replies
submitted by
Perhaps some instances or some add-ons do this. I think it should be native.
Yup. In PieFed you can get an alert based on comments on a post, comments in reply to a comment, posts in a community, posts in a topic, posts in a feed, or posts done by a particular person. We're really gone to town on it.