From a comment by Tim Post concerning the arbitration opt-out process:
You'll get a response, and our system is pretty good at catching spoofs (if someone makes DNS lie, then, well, nobody can catch that). And when we make the function something you access from your profile, we'll prod you to review your setting, most likely, so the worst case is really narrow to begin with.
That was back in May. It's now
June October March 2019, and I don't see anything like an opt-out button on my profile page. Is it still being worked out, or was it dropped? Is email the only option?
(On a side note, the ToS notification email that came out a while ago says nothing about the arbitration clause. When did (or does) the clock start ticking on the opt-out?)