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:
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, KBin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration), Search Lemmy
I suspect the type of person who was motivated to move to Lemmy is the type of person who posts more often.
There are also people who are posting here more because they want to participate and see Lemmy grow. I know that is me and I can't be the only one. I've posted more on Lemmy than the last 3 years of Reddit combined im pretty sure. I always just lurked over there but I want this to go well so I participate more.