With the verdict in-hand, Sable was probably voluntold by Cloudflare.

If Cloudflare thought they had a shot at recovering costs, $225k and a patent-portfolio could be substantially less than whatever Cloudflare (or their insurance) had paid in defense-costs.

They had those patents only to sue other companies and get money, now some of those patents were invalidated by prior art and to Sable are essentially toilet paper. The action is unlikely to be goodwill, more likely admitting defeat and closing the patent troll company.

Cloudflare has negotiating power. They would prefer to give up some of the legal cost recoup in exchange for the public crucifixion of the trolling firm. It's intentionally painting a very scary picture of what happens when you sue Cloudflare, as a deterrent.

As I read this, all but one of Sable's patent claims got invalidated in an IPR (a patent proceeding), and the last one got invalidated by a jury at trial. When your patents have no claims left, you aren't doing anything by releasing the patents to the public. It's been defanged anyway.

Deterrence.

Cloud flare wanted to send a message to other potential patent trolls that they would not go for money damage but into invalidating their patents too.

So they can't use them to sue anyone else ever again. Basically they're hosed.