We’re seeing an increase from 53k active users at the beginning of July to 72k active users at the time of this post.
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.” Lurkers aren’t considered active users, so basically these are content creators on Lemmy.
Sources:
As have I — this site has effectively wholly replaced reddit for me outside of search.