I think he’s gone on record as saying he’s just going to maintain Pixel Pals. That’s the one thing Reddit couldn’t take away from him, and I wish him all the success with it.
You probably already know about wefwef.app but I'm going to mention it here for anyone reading. It's cross-platform and already shockingly close to feeling like Apollo
I think he’s done relying on API beyond his control. Understandable. As federated and open as lemmy / kbin is right now, there is still a chance for a large company built a tiny wall around it. Like gmail has done with email.