Current breakdown at the time of this post sorted by the number of active users:
- lemmy.world: 101,013 users
- lemmy.ml: 41,972 users
- beehaw.org: 12,270 users
- sh.itjust.works: 17,509 users
- feddit.de: 8,675 users
- lemm.ee: 10,348 users
- lemmynsfw.com: 22,967 users
- lemmy.fmhy.ml: 8,777 users
- lemmy.ca: 5,072 users
- programming.dev: 5,058 users
90-9-1 rule says that you may in fact be correct.
90% are probably lurkers. But there is a good argument to be made that a lot of the recent growth is from the 9% of contributors on Reddit, and some of the 1% also.
Currently I suspect that much less than 90% here are lurkers, but that should balance out over time just due to how social communities work.
You’re likely correct on all of your assumptions, in my opinion :)