Recently some Twitter users have asserted that they are being defamed by Twitter "block bots."
It's easy to block people manually on Twitter, unless you want to block a whole lot of them. Various cultural and political conflicts online have led some users to develop blockbots, which are lists to which you can subscribe (to oversimplify the process) to mass-block everyone on the list. Some lists are created by methodology (like automatically blocking people who follow certain Twitter users affiliated with "GamerGate") and some, like BlockBot, are curated by individuals who choose who goes on the list and why.
Some folks don't like how they are characterized by these lists. BlockBot targets complain of being characterized by mostly anonymous and unaccountable strangers as "racists" or "transphobes" or "rape apologists." Some argue that merely being on a blocklist means they are being characterized as a harasser or affiliated with harassers.
Dissenters may have a point that the lists are unfair or unprincipled. I wouldn't use one myself.
But they almost certainly aren't libel.
[...]
Perhaps, like me, you find it odd that people who say they oppose thin-skinnedness and support free speech are resorting to government help from a censorious system to protect themselves from mean words.