In the comments of this post, Tim Post responds to my request for a "secure, electronic means" of the opt-out of mandatory arbitration with the following
@jhpratt And you'll get one. And a lot of other people in this community wanted an update on this yesterday that included a means that was more convenient, such as email. I can't pretend to be able to please everyone in one fell swoop. A more secure means is coming, you're welcome to wait until then. I would have loved to wait until that was done, but I would have made quite a few people very sad and angry
This comment was made on May 10, 2018. As of this post, it has been 16 months since that comment was made. Multiple people have pinged Tim Post since this initial comment, including myself multiple times, most recently three days ago.
I have still not opted out due to Stack Exchange's failure to uphold its promise. I did not use the email method, as I know for a fact that is not secure, and as far as I'm aware, there was never a public key that we could encrypt the message to (and sign it ourselves). I'm not a lawyer, but I suspect the clause would have difficulty holding up in court due to this failed promise.
Where is our secure out-out of mandatory, binding arbitration that was promised?
All we need is a profile switch. What is taking so long?
Edit: A number of people are mentioning I could have emailed them. Yes, but that's not the point. I have been waiting 16 months for a promised solution that has yet to be released.