There are instances that still work for me.

LibReddit seems to be working still. At least my instance is.

Fuck those asshats that are in charge over there. They had a good thing and pissed all over it

Both teddit and libreddit have been down more than up the last couple of days for me. However, I discovered an android app that is still working. Geddit. I don’t claim to understand why the former two don’t but the latter still does.

Reddit front-ends access Reddit data in a way that is now bound by much stricter rate-limiting than ever before.
Popular instances may be usable for a short time until their limit is reached, then they will 429 like everyone else.
If you, personally, host a Reddit front-end instance, you are still affected, you are just less likely to reach the limit as quickly as public instances.

Here’s what the Libreddit project intends to do about it: https://github.com/libreddit/libreddit/issues/836
If similar projects plan to continue, they will likely follow a similar approach.