no one can view old.reddit.com w/o being authorized. idk if you're aware, but it lost a lot of appeal as such. what i'm saying is, folks can view reddit.com w/o logging in, but not old.reddit.com
And it is federated so when the biggest Lemmy instance starts to suck, Lemmy can be the Lemmy replacement, too.
I understand that mentioning it on popular subreddits is verboten.
Many servers defederate from each other regularly, making it very much a "which wind would you like to piss into" situation where you have no idea who (if anyone) is even seeing your messages.
That's the entire reason I use old.reddit - the New Reddit backend is a pile of unreliable dung. Just like everything that is made with GraphQL.