I don’t know if you need this info, but I was pretty disturbed to see unexpected child pornography on a casual community. Thankfully it didn’t take place on SLRPNK.net directly, but if anyone has any advice besides leaving the community in question, let me know. And I wanted to sound an alarm to make sure we have measures in place to guard against this.
I recommend instance admins have a minimum of discretion when federating, or users move to an instance that blocks lemmy.world to significantly decrease this risk.
If you saw it, it’s federated.
There is no reasonable measures or administration tools to combat this (that I’m aware of) beyond simply defederating. Even blocking repeat offending communities will still transfer the illegal images to ones home instance - But nobody will know.