Uhh, I'm not seeing any system requirements, am I blind? It just warns against using the /list command if you have a very slow internet connection since it produces rather voluminous output. If you scroll down a bit further they also link to a third-party website that has a searchable index of all publicly visible channels.
No, CS has explicitly stated that the cause was a logic error in the rules file. They have also stated "This is not related to null bytes contained within Channel File 291 or any other Channel File."
That link seems to show a very different story though? What they said was that they _hadn't_ requested a takedown for those reasons
"Simply put, the actual process of requesting the take down and proving violation would have severe implication on Wenzheng Tang, so I have hesitated in the hopes he would simply choose to take it down himself."
"So, both repositories remain up, for now, not because we are powerless to take it down... it is that the process of exercising this power could very literally ruin the actual life of another person."
I'm sure if you're a reputable hosting provider able to sponsor a server then libera will be interested, even if there's no official procedure documented yet for offering hosting.
Libera is effectively the spiritual continuation of freenode, managed by the former freenode operators. Freenode on the other hand is now under control of new management, which has in very short time already managed to prove itself inept and abusive.
While it perhaps seems a bit heavy-handed, it's an easy way to ensure people notice the channel has moved, even if they haven't been following the news, and thus minimize damage to your community. I don't see how this action is "contempt for the community".
"How many people actually moved?" .. I'd presume everyone who wants to be in that channel and who has noticed that it has moved. Why would they not?
Also note that this example seems to be the exception, many channels that got hijacked merely mentioned the move in topic or even just mentioned libera in topic without any decision to move being finalized (though the hijackings did a great job at finalizing those decisions ;)