Parent's HN profile indicates a 2009 registration date and whose Keybase reveals they're a software dev... I'd bet he knows how to block javascript and/or maintain a host files block list. But I'm being assumptive.
How is maintaining a local block list opting out? It certainly doesn't seem to have legal force.
Presumably we have different definitions of opting out. I was thinking more of the DIY type. It's certainly more reliable than to trust the people you don't trust not to track you because you tell them not to.