The data this is based on comes from https://lemmyverse.net where you can just download a full json of the data they have (I excluded all communities marked as "suspicious")
EDIT: The data if you sort by active users last month:
Manually counted communities in the top 100 per instance and threw it into another pie chart (for active users / month)
This also seems to be different than the results gotten from lemmyverse as the lemmyverse data hasnt been updated in 11 days according to that site
A bunch of instances gained or lost some coms in the top 100 from variance of things happening in the last week
(the eight instances that it decided to not give labels to that have 1 community are feddit.uk, lemmy.zip, beehaw.org, lemdro.id, ttrpg.network, lemmy.wtf, lemmy.blahaj.zone, mander.xyz)
edit: updated graph to be more accurate users/month counts
I looked at the community list in programming.dev (from https://programming.dev/communities) sorted by active users per month and noted down the instances for the top 100 communities
its using google sheets
going to recount with lemm.ees community list in a sec since theyre federated with hexbear
Seems like lemmyverse doesnt have the instance listed at all for some reason, assuming a crawling issue. I reported it on their repository. Would be new since I remember it showing the instance before
It sometimes does that when the crawler hasn't had time to fetch a large proportion of the instances in the last 4 hours. the data should be pretty recent still. I'll check on it now :)