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Applied AI·April 15, 2026·1 min read

Cal.com, which provides scheduling software, is moving its core open-source codebase to a closed repository, citing the dangers of AI hacking its open code (Steven Vaughan-Nichols/ZDNET)

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When a scheduling tool vendor cites ‘AI hacking open code’ as the reason to close source, the open-core model is under direct pressure from automated exploit discovery. If your moat depends on obscurity or license terms instead of service, ecosystem, or brand, assume AI-enabled attackers and competitors will erode it faster than your roadmap anticipates.