Say what you will about 4chan but I am concerned for the team managing it - them and their close ones are certainly going to be exposed to a whole lot of viciousness soon :(
Isn't viciousness the notorious bread and butter of 4chan?
Any increase in human suffering is unfortunate, regardless of one’s take on just desserts or karma or whatever.
The staff has cut down a lot on organized harassment that 4chan was notorious for in recent years. Those people migrated to private discords, telegrams, and other forums (like kiwi farms, soy party, etc). Ex, #gamergate was mostly an 8chan, Twitter, reddit, and IRC phenomenon - #gg people would get banned if they tried posting about it on 4chan
It might end up making them more sympathetic people on the long term. They might realise the seriousness of what they have done to others.
If the hacker is a state actor then I don't think anyone has learned anything about Free Speech.
People can leave the platform. They can't leave their race.
Even though it might be hard to ignore the well-budgeted choir of well-intentioned promoters of status quo, you still don't have to believe in this concept.