Over 350,000 developers used Promptfoo to red-team AI applications across 60+ providers because it belonged to nobody. That neutrality was the product. OpenAI has promised to keep the project open-source and multi-provider. Promises are cheap; structural incentives are patient.
The default red-team grader already runs on GPT-5. The roadmap now shares a team with OpenAI's enterprise platform. No governance firewall between the open-source project and the proprietary product has been announced. The code stays open. The question is whether the community still trusts it.
You can fork a codebase. Forking a contributor ecosystem of 248 people and Fortune 500 adoption is a different proposition entirely.