It's all related to the issue of Sec. 230 reform. The Courts have ruled
Sec. 230 was intended to encourage internal, self regulation. An opt-out
policy is exactly that--self regulation. In the absence of self-regulation,
there will be a Mothers Against Defamatory Dissemination (MADD) style
lobbying movement to force rewriting the Law; and the Congress people who
write the Law will grow tired of responding to allegations they are
pedophiles & holocaust deniers.
So it's a simple question: the industry either self-regulates, or the
government will self-regulate you on your behalf.