The biggest surprise for me was the https://hexbear.net count, an instance I hardly interact with.
| beehaw.org | hexbear.net | lemdro.id | lemmy.blahaj.zone | lemmy.dbzer0.com | lemmy.ml | lemmy.one | lemmy.world | lemmynsfw.com | sh.itjust.works | sopuli.xyz | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Community Count | 6 | 33 | 1 | 1 | 1 | 14 | 1 | 39 | 2 | 1 | 1 |
| Community Subscriber Count | 133450 | 663204 | 17052 | 15907 | 53006 | 356460 | 16257 | 851950 | 33586 | 16006 | 14093 |
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:
| awful.systems | feddit.org | feddit.uk | hexbear.net | lemdro.id | lemm.ee | lemmy.blahaj.zone | lemmy.ca | lemmy.dbzer0.com | lemmy.ml | lemmy.world | lemmy.wtf | lemmy.zip | mander.xyz | sh.itjust.works | slrpnk.net | sopuli.xyz | ttrpg.network | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Community Count | 1 | 2 | 2 | 1 | 1 | 3 | 1 | 3 | 3 | 10 | 57 | 1 | 3 | 1 | 5 | 3 | 2 | 1 |
| Community Active Month Count | 2616 | 7363 | 5289 | 2952 | 2898 | 8898 | 11422 | 14910 | 13752 | 54949 | 338384 | 3602 | 12020 | 11469 | 37365 | 10897 | 10070 | 4107 |
Community Count:
Community Users:
You can talk on their instance. If the moderator of your instance dis not wanted you to interact with this other instance they would have block it.
That I'm not sure. But I think there is a copy of the content you accessed on your instance. Maybe someone administrating an instance could answer you better than I did.