4 days before reddit's 3rd party app shutdown, Lemmy daily active users has skyrocketed 1600% this month
From 3000 daily active users on June 1, 2023 to 47500 on June 26, 2023.
According to Lemmy's documentation, "An active user is someone who has posted or commented on our instance or community within the last given time frame."
I doubt many people will move. Most people will just start using the official app or move to another website. Lemmy doesn't have much content (yet), and that's yet worse than not having a good app. They will just quick look and go back, if even.