What should I ask Moxie Marlinspike?

Yes I will be doing a Conversation with him, live at the Roots of Progress event next week. From Wikipedia:

Moxie Marlinspike is an American entrepreneur, cryptographer, and computer security researcher. Marlinspike is the creator of Signal, co-founder of the Signal Technology Foundation, and served as the first CEO of Signal Messenger LLC. He is also a co-author of the Signal Protocol encryption used by Signal, WhatsApp, Google Messages, Facebook Messenger and Skype.

There is much more at the link, for instance he is also an anarchist of some kind or another. So what should I ask him?

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