The most underappreciated insight here is that the test suite turned out to be more valuable than the source code itself. 2k unit tests + 400 E2E tests effectively served as a machine-readable specification that an LLM could target. This inverts the traditional open source value proposition: previously, the code was the asset and tests were the safety net. Now the tests are the asset and the code is replaceable. Expect frameworks to start treating their test suites as proprietary even if the source stays open.