This is a project that I'm using to play around with the ATProtocol that is what powers Bluesky.
The idea is that you reply to a post with /subscribe and then when anyone replies to the post you subscribed to, it will appear in a feed that is curated for you.
It is currently a WIP and only configured to listen to /subscribe messages from my did (account) but once it's up and running I will open that up.