ISPs get threatened all the time and don't take content down just because some rando is mad. Kiwifarms needs to provide proof that ISPs are being threatened, as opposed to the more likely scenario that the harassment victims are filing normal abuse complaints and alerting the ISP to the TOS violations taking place all over the site.
If this were the case, I wonder how 4chan, stormfront, etc. stay online. Surely 4chan's providers get floods of complaints about doxxing etc. Or pastebin for that matter.
The fact that the EFF is writing about this case and that they're forced to use KF as their one example (clearly they find this distasteful & would prefer to use any other example if they could) indicates that something is unique or at least peculiar about this case.
Compared to 4chan, kiwifarms admins take a more active role in directing and encouraging harassment towards specific targets. it's a lot easier to tie the illegal activity to the site's owner. and the cops don't do shit because internet harassment is a seriously under-prosecuted crime. even the EFF admits that. the only route for victims is to follow the chain of upstreams till they get one that isn't in league with kiwifarms. (kiwifarms' hosting provider is even posting in this thread spreading the same untruths the kiwifarms admin says)
4chan, pastebin go beyond the bare minimum legally required. 4chan includes "You will not post or request personal information ("dox") " and pastebin's prohibits content that is "libelous, defamatory, or fraudulent" and "discriminatory or abusive toward any individual or group"
The other difference is the site owner actively encourages harassment and bans any discussion to the contrary
I've been doxxed & threatened on 4chan[0] (most of the doxxing was actually on pastebin), I contacted 4chan admins and received no response. 4chan does little or nothing to combat doxxing & harassment, I think you're incorrect that these sites "go beyond the bare minimum legally required" at least not 4chan.
4chan does remove posts and IP bans users for posting doxx. The thing is that IP bans are easy for some to work around. And that all 4chan threads expire after some time.
If you filed abuse tickets with the companies hosting 4chan, you should be able to get some response. The kiwifarms victims are demonstrating this is possible. There is hope for you. I wish you luck.