From 2,997 active users across all lemmy instances at the beginning of June, the number increased to 52,797 by June 30th. Source.
An active user on Lemmy is "someone who has posted or commented on our instance or community within the last given time frame.” Source. That means lurkers are not counted as active users.
We’re really building something here!
The complication comes from things aside from the sign-up process. It’s understanding instances and navigation. People don’t know how it works. I.e. what is the equivalent of a subreddit? Who hosts it? Is it someone’s personal server? What if it goes down suddenly? Etc.