At the project’s inception, there was an agreement that the project would be contributed to the CNCF when it was mature. If this is true, the authors could be

At the project’s inception, there was an agreement that the project would be contributed to the CNCF when it was mature. If this is true, the authors could be sued for breach of contract (what the damages would be, I'm not sure). However, I suspect that this agreement was verbal or implicit and wasn't actually written anywhere. As they say, a verbal agreement is worth the paper it's printed on. Get your promises in writing, folks.