The Expanding Dark Forest and Generative AI.

Humans who want to engage in informal, unoptimised, personal interactions have to hide in closed spaces like invite-only Slack channels, Discord groups, email newsletters, small-scale blogs, and digital gardens. Or make themselves illegible and algorithmically incoherent in public venues.
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How would you prove you're not a language model generating predictive text? What special human tricks can you do that a language model can't?