PieFed seems to be the only fedi software that allows you to automatically receive notifications on a post when you comment on it (which i love!) so I'm wondering if this was something custom you built since no one else has been able to ship this.
Is there somewhere I could point others to so they could learn from your work?
EDIT: Not sure if I'm misunderstanding the notifications, if I keep it on do I get notifications about replies to only my comment or any replies to the thread (which is what I want, like forums did\do)
https://join.piefed.social is the general project hub for PieFed, it has some background and techy blog posts.
Currently the notifications are just replies to only your comment. A more flexible and wide-ranging subscribe-to-anything notification system is a high priority: https://codeberg.org/rimu/pyfedi/issues/20