Reddit could never function with #nostr. Reddit's model is to have a lot of different and separated sub-reddits, something that goes against the nature of #nostr.
Discussion
Why not, each relay having its own subreddit could work right?
Relays are dumb, they just forward notes along. There could be a relay that just forwards notes of a certain nature, making it kinda a sub-reddit, but the notes it forwards would eventually reach another relay, and everyone would see the note in question. There's no way (at least in my view, for now) to contain a note in the widespread #nostr network.