That's going to jump again when Apollo quits working on Reddit, if they don't back down on this API thing. It's going to be an exodus, probably break the internet (so to speak).
Lemmy
Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.
Of those who use third party apps I would how many will refuse to use the official reddit app as a result start transitioning into non contributing lurkers given how terrible the browser experience is too on mobile.
Thing is people that use Apollo and other 3rd party Reddit apps really love their interface. Personally I do everything on a laptop/desktop so I'm not familiar with those apps. I don't do much on the phone other than text/voice. Though I have tried to access Reddit through Chrome mobile and it's pretty much unusable. Their in-house app is not much better from what I understand.
Since Reddit's API pricing is going to wholly drive away 3rd party apps, I think it's going to come down to Lemmy's apps versus the Reddit in-house app. From what I understand the bar is pretty low so Lemmy just needs something that works decent.
Jerboa for Lemmy isn't bad, and it already has more features than it did when I joined a week ago, so I think it'll keep improving. I also know that at least a few refugees have posted that they're working on apps for Lemmy, too, and basing them on their preferred 3rd party app for Reddit. There won't be a lack of good options for Lemmy apps.
@lemmy forgot about Diaspora, I don't know why FediDB doesn't list it...
If you take monthly active users, Lemmy is the third and Kbin the second one. But I have concerns about how each Fediverse software counts its MAU.