Willison uses Claude to build Bluesky bot detector

The story frames this as a moderation gap, but the actual shift is architectural: Bluesky's open API is becoming a moat for third-party tooling that Twitter's walled garden cannot replicate. This isn't about one bot detector; it's about which platform will accumulate the infrastructure layer.

This connects directly to the S3 pricing story from earlier this month. Just as AWS's stalled storage costs signal a market where infrastructure commoditization has plateaued, Bluesky's API openness is becoming the commodity that attracts builders. Both stories reflect a broader pattern: when a critical input (storage pricing, API access) stops improving or becomes restricted, it reshapes where investment and effort flow. Twitter's API restrictions didn't just block one tool; they've ceded an entire category of platform-hygiene solutions to competitors with open APIs.

If Bluesky's moderation tooling ecosystem (bot detectors, spam filters, content classifiers) reaches feature parity with Twitter's built-in systems within 12 months, it confirms that open APIs are now a primary competitive advantage in social platforms. If Twitter's API restrictions persist through 2027 without loosening, that's your signal the company has chosen to absorb moderation costs internally rather than enable the community to do it.