Nothing4You

it's also the case for deletions without account deletions, but iirc there is some delay before it gets rewritten in the db to allow the user to undelete it for a bit of time.

only admins can set communities to hidden currently. this is also not exposed via lemmy-ui, it has to be done via API.

they're using my federation exporter as data source.

it's just scraping the federation api every 5 min for each included instance and then visualizing that.

there seems to be a codeberg mirror but it's not updated continously: https://codeberg.org/LemmyNet

instances get added automatically once they reach a threshold of monthly active users. iirc it's >6 mau, you could check the code to confirm.

the mod got banned from blahaj, which, when set to also remove their content, removes communities they're head mod (or only mod?) of as well: https://lemmy.blahaj.zone/modlog?page=1&actionType=ModBan&userId=124892

that post on lemm.ee in your first point is dead

you shouldn't reuse domains on the fediverse for a new instance anyway, subdomains are fine though: https://programming.dev/comment/14173239

I'm pretty sure it's doable but it might be necessary to become a mod first, which admins should be able to in remote communities as well iirc. it's just that their mod actions won't federate.

based on the creation date advertised by the instance, lemmy.ml exists since 2019-04-20. lemmy.world exists since 2023-06-01.