Private corporations have a right to use their First Amendment rights to censor what they "publish". Absolutely.

I was misunderstanding the target here, which I thought was having the government force ISPs to block KF.

ISPs couldn't do anything at all before 2018 or they'd lose their common carrier protections. Those were stripped away, but common carrier protections got enacted in a bunch of states to plug that hole.

Also there are things like states that required ISPs adhere to the common carrier rules or they would withhold public monies and contracts: Colorado, Hawaii, Maine, Montana, New Jersey, New York, Oregon, Rhode Island, and Vermont

so like it or not, this is a huuuuuge mess.

https://www.wlf.org/2021/06/22/wlf-legal-pulse/states-and-isp-common-carrier-requirements-a-tale-of-two-courts/#easy-footnote-1-17899

I'm not aware of the litigation being resolved yet, but it's good to know that there are plenty of people out there that want to give up on Net Neutrality because of some hate speech lol