In short, Reddit is killing off most third party apps and bots, like Apollo, which provided the moderation tools that let reddit's feed not be full of spam and garbage, and are what made this site even usable on mobile. They're doing this by charging insane amounts of money that no one will be able to pay (20 million dollars for apollo). They're also straight up lying about and insulting the app devs. Here's Apollo's dev debunking those lies.
This will also prevent blind, deaf, and people with other disabilities from engaging in discussions on Reddit.
People protested. First, subs were closed and privated, but were forced open by admins, so now they're protesting by only allowing John Oliver pics, or taking sub names literally.
Alot of them them have moved to Lemmy and kbin, which are both compatible with each other.
Reddit Sync's dev is now working on Sync for Lemmy instead.
Artemis for kbin/Lemmy and Memmy for Lemmy are both heavily inspired by Apollo; Artemis will even be on both Android and IOS.
This picture explains simply how Lemmy and kbin work and how they're compatible; they are both part of the Fediverse.
Sub.rehab lists subreddits that have officially moved off of reddit. Honestly, just ignore the few that aren't on Lemmy or kbin. Just join the largest Lemmy or kbin community for full compatibility.
There's also Lemmynsfw.com for NSFW communities/subreddits (not listed in sub.rehab) that you can seamlessly access from any instance/server the same way explained in the picture linked above.
Just join any Lemmy or kbin server/instance to access everything; doesn't matter which because they're all connected. Lemmy.world, Lemm.ee, vlemmy.net, kbin.social, fedia.io are all great for example.
For subreddits you like that haven't moved off of reddit yet, send a polite message to the mods asking them if they plan to make the subreddit/community in Lemmy/kbin.
Copy/paste this summary anywhere relevant to spread the word.