By illegal I mean a lot of things It could either be piracy, black market, child pornography, etc.
Well, if I saw an instance serving child sexual-abuse material (CSAM)¹, I would report it to NCMEC and possibly also the ISP where that instance was hosted. I expect that this would lead to it being taken down by the ISP or by law enforcement.
I think a lot of other users would do the same. We might also message our home instance admins and suggest defederating from that instance; but this is secondary.
However, if I saw an instance serving (say) torrent links for pirated movies, I would not feel any need to do anything about it. The copyright industries can pay for their own enforcement.
¹ By “CSAM” I mean material involving the sexual abuse of an actual child; not fictional stories or drawings. Y’all loli/shota manga fans may be perverts but you’re not molesters, and your stuff is not illegal where I live.
It would take a Jedi sysadmin to handle it.
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Groups of defederated instances could then stay federated between each of them. Don’t you guys fear that this could cause at some point a lot of harm to Lemmy’s public image?
If all the instances hosting illegal content federated with each other it would be easier for law enforcement to take them down