"too slow"
According to whom? Cloudflare? What would be an appropriate time for Cloudflare for law enforcement to respond? And to what threats?
You say "simply" but these are not simple questions.
Cloudflare can shut off service to anyone, sure, but in any other industry there would be some termination notice, right? Unless its something like terrorism, where LAW ENFORCEMENT sets the boundary, not the private company.
Would I want my ISP or CDN to cut me off without notice? No. Do we know they actually cut KF off without notice? Also no - it's possible this is after they gave KF's operator time to respond. But also, I wouldn't operate a site like KiwiFarms, so I'm not terribly concerned about my CDN cutting me off for the same reason. If it became more of a widespread pattern with CF I would understand their customers getting nervous.
From the Admins Telegram: "Cloudflare's decision to block the site was done without any discussion. The message I've received is a vague suspension notice. The message from Matthew Prince is unclear. If there is any threat to life on the site, I have received no communication from any law enforcement."