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On 2026-06-22, cryptographer and commentator @matthew_d_green warned that new…

Brief

Matthew D. Green (tweet, 2026-06-22) argues that deploying a new technical capability to combat harms like child grooming and CSAM will not lower their incidence. He expresses a stark, historical pessimism, claiming these problems "will never, ever go down" because they have not decreased in the past, framing the future as unchanged despite new interventions.

Why it matters

On 2026-06-22, cryptographer and commentator @matthew_d_green warned that new capabilities intended to stop child grooming and CSAM will not reduce those harms.

Key details

  • Green asserts a historical pattern: child grooming and CSAM incidence "will never, ever go down," because "they never have before."
Source evidence

And the worst part about this future; all the bad things we’re trying to stop by using this new capability — child grooming, CSAM, etc. — those numbers will never, ever go down. Because they never have before.